9.47K reviews
Content rating
Everyone
100K+
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Everyone
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About this app

With the free ja! mobil app, you quickly and easily have full control over your usage and data at a glance.
The ja! mobil app offers the following features:
For prepaid and contract plans
- View usage
- View data, SMS, and minutes
- Manage plans and options
- Change plans, book, or cancel options
- View and top up prepaid credit
- Manage SIM and eSIM plans
- Block/swap SIM cards, activate eSIM, view PIN and PUK
- Change personal data
- Change address or authentication PIN

We are continuously developing our ja! mobil app and welcome your reviews and constructive feedback.

You can find our app's accessibility statement at: https://www.jamobil.de/barrierefreiheit

We hope you enjoy our app!
Your App Team
The personal yes! mobile customer area for on the go.
Updated on
Sep 7, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Personal info, Financial info and 3 others
  • Data is encrypted in transit
  • You can request that data be deleted

Ratings and reviews

9.2K reviews
Gr Nо
August 5, 2026
Maybe at least English? or other Global languages. Minus two more stars for impossible topping up phone account (except pre setup numbers: 5, 20, 25, 30). It's time to move forward in XXI century.
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congstar Services GmbH
August 5, 2026
Thank you for your feedback. Your requests are completely understandable. We are continuously improving our app and will look into these issues.
alaa elabdullah
June 19, 2026
Bad customer service, don't waste your time with them or there mother company. Bought start packet with sim card then identified myself and didn't want to activate the sim card. reason is company policy that is unknown for the customer and won't tell me why. Avoid jamobil and Congstar(mother company) as possible.
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congstar Services GmbH
June 19, 2026
Thank you for your honest review. Please get in touch with us via the app’s built-in feedback feature. We’ll then look into it together. If you’d also like to rate our app, please feel free to edit your review.
Eric Lawrence
June 27, 2025
New update logs you out of your account. Then no matter what you do it says your credentials are incorrect, even when they are. This update is absolute dog doo doo. Edit: responding to the reply from the developer. There is no way to provide feedback from within the app because there's no button except logging in, which doesn't work, hence I am here. You already know what version of the app it is, the current one and I'm on the android store, do your job.
2 people found this review helpful
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congstar Services GmbH
June 29, 2025
Hey Eric, thank you for the review. Please contact us through jamobilapp@congstar.de so we can take a look into the issue. We need further Data to analyze the cause. Many thanks for your understanding.

What’s new

Die MultiSIM kann ab sofort auch als eSIM gebucht werden! Außerdem haben wir Verbesserungen bei Usability und Barrierefreiheit umgesetzt.
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Content rating
Everyone
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App support

About the developer
congstar Services GmbH
meincongstarapp@congstar.de
Bayenwerft 12-14 50678 Köln Germany
+49 1515 3987902
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