# How to get a unique device nummer

**URL:** <https://community.thunkable.com/t/how-to-get-a-unique-device-nummer/402306>\
**Category:** Questions about Thunkable X\
**Created:** [January 11, 2020, 2:35pm UTC](https://community.thunkable.com/t/how-to-get-a-unique-device-nummer/402306 "2020-01-11T14:35:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![funhall](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/funhall/32/92145_2.png) [@funhall](https://community.thunkable.com/u/funhall)\
**Post date:** [January 11, 2020, 2:35pm UTC](https://community.thunkable.com/t/how-to-get-a-unique-device-nummer/402306/1 "2020-01-11T14:35:53Z")

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I like to know how I can prevent the same person to log in to my app with 2 different emails. So can I get a unique device number to tell me that there have been logget in from this phone before?  
Can I set a stored variable that dont delete if I delete the app and install it again???

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**Author:** ![jared](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/jared/32/138473_2.png) [@jared](https://community.thunkable.com/u/jared)\
**Post date:** [January 11, 2020, 5:01pm UTC](https://community.thunkable.com/t/how-to-get-a-unique-device-nummer/402306/2 "2020-01-11T17:01:53Z")

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I would use the push notification component to get a user id. i think this is device specific.

 ![Screen Shot 2020-01-11 at 11.50.15 AM](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/f/5/f570b499045065e31155f8f7da96102abd93464f.png)

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**Author:** ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)\
**Post date:** [November 8, 2024, 11:46am UTC](https://community.thunkable.com/t/how-to-get-a-unique-device-nummer/402306/3 "2024-11-08T11:46:03Z")

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