How to pass the ''Unknown Error'' code in Play store!
Sometimes when you are trying to install or update some apps from Play Store, occurred some error like :error 921 ''can't download or update app", ...
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One of the security settings embedded into Android is finding a stolen phone. There is an ability in android which can alert the user the new phone number and the current GPS position of gadget when the SIM is changed. To Enable SIM Change Alert on Galaxy Samsung or other Android phones, do as follows:
1: Go to Settings,
2: Go to Location and Security (ON some devices like Galaxy S2 just Security)
3: choose SIM Change alert,
4: For Samsung Galaxy Owners: enter your Samsung Account information
5. Enter the Text Message and the Numbers which get the Message if the SIM is changed