Don't worry, it's not that difficult
Real Fix For Android Not Receiving Text Messages – SMS [SOLVED]
If you are not receiving text messages on your Android phone, it could be due to a carrier, network, or phone issue. These issues usually prevent new messages from arriving or showing up on your phone.
You don’t have to worry too much when the problem occurs as it is quite easy to fix this kind of error. You can change your phone’s network and a few other settings to receive new SMS and MMS messages.
If you previously used your SIM card with an iPhone that had iMessage enabled, you'll need to disable this feature in order to receive messages on your Android phone.
