(11) I have no service on an Android phone. What's wrong? - Quora

(11) I have no service on an Android phone. What's wrong? - Quora

1. Network issues - Got to Settings<Mobile Network/Wireless and Mobile Network/Similar Option (Depends on ROM you have)<Cellular Network/Network Provider<Choose Automatically.

If this does not work and your ROM offers "Choose Manually/Select Network" and see if anything shows up. Choose the appropriate provider and you should be good to go.

2. SIM issues - Take out the SIM card and insert it into another phone (borrow from friend if needed) and see if signal shows up. This is especially applicable for the new 4G USIM cards (I use this  method myself for fixing my Airtel USIM card). If signal shows up, insert SIM card into your phone and restart it.

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