It happened twice when the mobile turned off because of no battery, when restarted, it could not find the network (for one sim only) but it could detect the sim. Last time I get a Sim replacement. Today I had the same problem, but I solved it going to Set

Now, remove the battery and SIM card from the device, wait for 2 minutes after which re-insert the battery but not the SIM card. Turn on the device and type (*#197328640#) again from the phone dial. Next, go to Debug screen> phone control> Nas contr

If it feels that the SIM card is moving within the metal bracket then there is a possibility that the movement causes the connection to be lost and you get a no signal problem. If you find the SIM to be moving a lot, take the phone to the manufacturer to