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I want to flash a custom rom on my S3. I was wondering if I take a Titanium Backup of all the applications and data on my phone, would I need to re-register (sim verification) for applications like WhatsApp, Tango, Viber etc. even after I restore the data?

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I wouldn't put my hands in the fire for that -- but as TB backs up all the apps data, I'd say a proper restore would look to the app as if nothing happened, so you would not need to re-register. At least not if IMEI/IMSI/... stay unchanged (I don't know what they check) and your Google Account etc. stays the same. – Izzy Mar 11 '13 at 10:09

When you flash a custom rom and you are coming from different version of android, restoring app data may cause some problems. If you restore your Whatsapp's data may cause crashing that App. So its better not to backup data,backup just that Application. If you are flashing same android version it may not cause issues. And you don't need to re-register.

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up vote 3 down vote accepted

I played with fire and went ahead and backed up my data with TB, flashed a custom rom (ParanoidAndroid 3.0) and restored the backup! Well, this is how it went:

  • WhatsApp - restored the data without re-registration

  • Tango - re-register

  • Viber - restored

  • Google+ - log in required and configure the settings

  • Facebook - already logged in (but re-sync contacts)

  • Path - already logged in

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