
Montenegro SIM Card vs eSIM: EU Roaming, Cruise Stops & Coverage (2026)
Montenegro isn't in EU Roam Like at Home. Compare tourist SIMs and eSIMs for Kotor, Budva and Durmitor, including cruise day stops. Plans from $2.
ReadAuthor
Angelus Sharma
Published
September 21, 2026

If you're using a travel eSIM while travelling abroad, one question that can cause concern is: What happens when my eSIM data runs out?
The simple answer is that your mobile-data connection will generally stop once you have used all the data included in your plan.
For example, if you purchased a 10 GB travel eSIM and use all 10 GB before your plan expires, you will normally no longer be able to access the internet through that eSIM until you add more data, purchase another plan, or connect to Wi-Fi.
However, running out of data does not necessarily mean your eSIM itself has been deleted or permanently stopped working.
Your eSIM profile can remain installed on your phone even when its data allowance has reached zero.
With eSIMLLY, travelers can choose plans with different data allowances and validity periods depending on their destination and travel requirements.
Explore eSIMLLY travel eSIM plans
When your included data allowance reaches zero, your travel eSIM generally no longer has mobile data available to use.
You may notice that:
Websites stop loading
Google Maps cannot update over mobile data
WhatsApp messages stop sending until you have Wi-Fi
Social media feeds stop refreshing
Email stops synchronizing
Ride-hailing apps may not work
Internet-based calls may stop working
Your phone may still show the eSIM as installed and active in its SIM settings.
The important difference is:
eSIM installed ≠ data remaining
Your eSIM profile can still be present even though the data plan has been exhausted.
Not necessarily.
Running out of data doesn't automatically mean you need to delete the eSIM and install another one.
Depending on the provider and plan, you may have options such as:
Adding a data top-up
Purchasing an additional data package
Extending the service
Purchasing another travel eSIM
The options available depend on the specific plan.
If your existing eSIM supports additional data, you may be able to continue using the same eSIM profile.
Some eSIM plans support top-ups, while others may require you to purchase another plan.
If a top-up is available, it can be convenient because you may not need to repeat the entire installation process.
For example:
Original plan: 5 GB
Used: 5 GB
Remaining: 0 GB
If the plan supports a top-up, you could purchase additional data and continue using the service according to the provider's instructions.
For eSIMLLY, available options can vary by destination and plan, so check the details of your particular plan.
If your data reaches zero while travelling, don't panic.
Follow these steps.
If possible, connect to Wi-Fi at your:
Hotel
Airport
Restaurant
Café
Accommodation
This gives you internet access while you manage your eSIM.
Before purchasing anything, make sure the problem is actually that your data has run out.
A lack of connectivity can also be caused by:
Incorrect SIM settings
Network problems
Poor coverage
An inactive plan
Incorrect APN or network configuration
If your plan supports top-ups, check whether you can purchase additional data.
If a top-up isn't available, you may be able to purchase another suitable eSIM plan.
After adding data or activating another plan, make sure your phone is using the correct eSIM for mobile data.
Open a website or messaging application to confirm that mobile data is working again.
Yes.
Your eSIM running out of data does not prevent your phone from connecting to Wi-Fi.
Once connected to Wi-Fi, you can continue using internet-based services such as:
Google Maps
Social media
Web browsing
Video calls
Online travel bookings
This can be particularly useful if you need to purchase more eSIM data after reaching 0 GB.
This is an important distinction.
Suppose you have:
10 GB + 30 days validity
You could potentially use all 10 GB during the first 20 days.
At that point:
Data remaining: 0 GB
Validity remaining: 10 days
Your plan may still technically have time remaining, but there is no data left to use.
You would therefore need additional data if you want to continue using mobile internet through that plan.
This is why data allowance and validity period are two different things.
The opposite can also happen.
Suppose your plan provides:
20 GB + 15 days
but you only use 8 GB during those 15 days.
Once the plan reaches the end of its validity period, the remaining data may no longer be available.
So there are two limits:
Data limit: How much data you can use.
Time limit: How long the plan is valid.
You need to consider both when choosing a travel eSIM.
If your phone supports dual-SIM functionality, your regular SIM can remain installed.
You may be able to switch mobile data back to your regular SIM.
However, be careful before doing this while abroad.
Your home carrier may charge international roaming fees for mobile data.
If you purchased a travel eSIM specifically to avoid expensive roaming, switching your regular SIM back to mobile data could result in unexpected charges.
Check your carrier's international roaming terms before changing the data line.
It depends on which SIM provides your cellular service.
Most travel eSIMs are primarily data services. A data-only eSIM generally does not provide traditional SMS unless the particular plan specifically includes it.
If your regular SIM remains active, SMS functionality may continue according to your home carrier's roaming policies.
However, roaming charges can apply to some services.
This is another reason to distinguish between:
Travel eSIM data
and
Your regular mobile service.
Yes, if you connect to Wi-Fi.
WhatsApp uses an internet connection rather than requiring the travel eSIM itself to provide a traditional phone number for its data-based features.
So if your eSIM data reaches zero but you connect to hotel Wi-Fi, you can generally continue using:
WhatsApp messages
Voice calls
Video calls
Photos
Videos
Documents
Location sharing
If you have no Wi-Fi or other internet connection, WhatsApp's online features won't work through the exhausted eSIM data connection.
You can use Google Maps over Wi-Fi.
However, if you're outside and your eSIM has no remaining data, online map functions may stop working.
One useful preparation step is to download offline maps before your trip.
Offline maps can allow you to navigate certain areas without continuously downloading map data over mobile internet.
This is particularly useful for:
Road trips
City sightseeing
Hiking
Public transportation
Areas with poor coverage
Many travelers underestimate how much data certain applications can consume.
Some of the biggest data users include:
Streaming video can consume significantly more data than basic browsing or messaging.
Long video calls can use considerably more data than text messages.
Apps that automatically load photos and videos can consume data quickly.
Sharing your eSIM connection with a laptop or another phone can use large amounts of data.
Automatic photo and video uploads can consume mobile data in the background.
Large application updates can use significant amounts of data if downloaded over cellular networks.
Downloading or streaming high-resolution photos, videos and music can increase consumption.
If you want your travel eSIM data to last throughout your trip, consider these steps.
Use trusted Wi-Fi for large downloads and software updates.
Offline maps can reduce your reliance on mobile data.
Video is one of the easiest ways to consume large amounts of data.
Configure your phone to update applications over Wi-Fi.
Some apps can consume mobile data even when you aren't actively using them.
If you're sharing your connection, monitor how much data connected devices are consuming.
Photo and video backups can consume large amounts of data without being immediately obvious.
The right amount depends on how you use your phone.
You mainly use:
Maps
Basic browsing
A smaller data plan may be enough.
You regularly use:
Maps
Social media
Messaging
Browsing
Ride-hailing
Occasional video calls
You may need a medium-sized plan.
You frequently use:
Video streaming
Video calls
Hotspot
Social media videos
Large downloads
You should consider a larger data allowance.
Your trip length also matters.
A 3-day trip and a 30-day trip obviously have different connectivity requirements.
Running out of data during a road trip can be inconvenient because you may depend on your phone for navigation.
Before travelling, consider:
Downloading offline maps
Saving your accommodation address
Saving important travel information offline
Keeping some Wi-Fi options in mind
Monitoring your eSIM balance
If your data reaches zero during the journey, you may need to find Wi-Fi before purchasing additional data.
For longer road trips, choosing an appropriate data allowance from the beginning can reduce this risk.
Airports often provide Wi-Fi, so this can be one of the easier places to recover connectivity.
Connect to airport Wi-Fi and then:
Check your eSIM balance.
Confirm your plan status.
Look for a top-up option.
Purchase additional data if available.
Activate the additional service if required.
Test your mobile connection.
If your destination airport doesn't provide convenient Wi-Fi, having your eSIM account information accessible before travelling can still be useful.
If you still have several days of travel remaining, you'll probably want to restore your mobile-data connection.
Your options depend on your plan.
You may be able to:
Option 1: Top up your existing eSIM.
Option 2: Purchase another data package.
Option 3: Purchase a new eSIM plan.
Option 4: Use Wi-Fi until you return home.
For a multi-day trip, relying exclusively on public Wi-Fi may not be convenient, particularly when you're travelling between locations.
If you're going home soon, you may not need another plan.
For example, if:
You have two hours before your flight
You're already at the airport
You have access to airport Wi-Fi
you may simply use Wi-Fi until you return home.
On the other hand, if you still have several days left, purchasing additional data could be worthwhile.
Consider the remaining duration of your trip before spending money on another plan.
No.
Running out of data and the eSIM plan expiring are two different things.
For example:
10 GB / 30 days
You can use all 10 GB on day 12.
Your data is exhausted, but the 30-day validity period may still have days remaining.
Alternatively, you could reach day 30 with 3 GB unused.
In that situation, the plan's validity has ended even though you still had data remaining.
This distinction is one of the most important things to understand about travel eSIMs.
Yes, you may be able to purchase another suitable eSIM plan if your provider offers one for your destination and your device supports it.
However, before installing another eSIM, check whether your existing profile supports a top-up.
A top-up can sometimes be simpler than installing an entirely new profile.
If you do purchase another eSIM, make sure you know which SIM is selected for mobile data.
Yes. eSIMLLY provides destination-specific travel eSIM plans with different data allowances and validity periods.
For example, depending on the destination, travelers can find smaller plans for light users and larger plans for people who expect heavier mobile-data consumption.
Popular destinations include:
Japan
France
Germany
Singapore
Thailand
Indonesia
South Korea
Mexico
And many others
Explore eSIMLLY destinations and plans
This allows you to choose a plan based on your destination, trip duration and expected data usage.
The easiest way is to plan ahead.
Before your trip:
Think about how often you'll use maps, social media, video and other data-heavy applications.
Don't automatically choose the smallest plan just because it costs less.
Download offline maps, tickets, reservations and other important information before leaving Wi-Fi.
Check your data consumption during the trip.
Find out whether your plan supports additional data before you need it.
If you're using a travel eSIM to avoid roaming costs, make sure your phone doesn't unexpectedly switch back to your regular SIM for mobile data.
If your eSIM data suddenly stops working, check these things before assuming you've run out:
Check your remaining data
Check whether the plan has expired
Check network coverage
Check that the correct SIM is selected for mobile data
Check whether mobile data is enabled
Restart your phone if necessary
Connect to Wi-Fi
Check whether a top-up is available
Purchase another plan if required
Avoid switching to your regular SIM's data without checking roaming charges
This can help you distinguish between zero data and an unrelated connectivity problem.
Your mobile-data service under that plan will generally stop once you've used the included data allowance. You can connect to Wi-Fi, top up if supported, or purchase another plan.
No. Running out of data does not automatically delete the eSIM profile from your phone.
Not necessarily. If your plan supports top-ups, you may be able to add more data to the existing service.
Some eSIM plans support top-ups or additional data packages. Availability depends on the specific provider and plan.
Yes. Your phone can continue connecting to Wi-Fi even when your travel eSIM has no remaining mobile data.
Yes, when connected to Wi-Fi or another active internet connection.
Online map features require an internet connection, but offline maps can still be used if you downloaded the relevant area beforehand.
You may be able to switch mobile data to your regular SIM, but international roaming charges may apply. Check your home carrier's roaming terms first.
Your data allowance has been exhausted even though the plan's validity period has not ended. You may need a top-up or another plan.
Unused data may no longer be available once the plan reaches the end of its validity period. Check the specific plan's terms.
Video streaming, video calls, hotspot use, social media videos, cloud backups and automatic updates can consume significant amounts of data.
Use Wi-Fi when practical, download offline maps, limit video streaming, control background data and monitor which apps are using the most mobile data.
Potentially, yes, if your device supports the required configuration and another suitable plan is available. Check which SIM is selected for mobile data after installation.
Running out of eSIM data doesn't mean that your phone or eSIM has suddenly become useless.
It simply means that the data allowance included in your plan has been exhausted.
If this happens, connect to Wi-Fi and check whether your plan supports a top-up or additional data. If not, you may need another suitable eSIM plan.
The key is to remember that data allowance and validity are different.
A plan can expire while you still have unused data, or you can use all your data before the plan's validity period ends.
Before travelling, choose your data allowance based on your actual usage, monitor your consumption during the trip, and understand your options if you reach zero.
With eSIMLLY, you can choose travel eSIM plans across 160+ countries, with different data allowances and validity periods depending on your destination and requirements.
Explore eSIMLLY travel eSIM plans
Choose the right amount of data before you travel, monitor your usage, and you'll be better prepared to stay connected throughout your trip.
Instant activation, hotspot included and no roaming fees in the destinations from this guide.

Montenegro isn't in EU Roam Like at Home. Compare tourist SIMs and eSIMs for Kotor, Budva and Durmitor, including cruise day stops. Plans from $2.
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