Samsung e2510 No Network Problem Solution

1 - put your new sim card inside the phone, but not totally plugged (the phone don't see the sim and boot without)

2 - put the battery on but leave a little space to push forward the sim at the end

3 - boot the phone, it will say 'no sim'

4 - push the sim with something slim

5 - reset the phone with the hard reset code 



* Don't let the phone turn off, or you will need to re-do the same thing again.