Does Old Sim Card Affect Signal. Restart the device and see if your signal is stronger. Dec 1 11 at 700.
So getting a new SIM card from service provider can fix the problem. My question is does the sim card affect 4G signal strength or do I have a dud phone. Sometimes you might not want to transfer your old cell number to your new network provider.
This can help improve the signal strength.
In that scenario what you can do is keep your old SIM card as a backup. I know with the older big sims if you handnt upgraded your SIM for awhile it would cause issues in newer phone models. My phone restarted and was on 4G for about 1 minute then it went straight to 3G. If there is no problem with the SIM card or the iOS and you still get the message searching for service on the iPhone then use some of the fixes described below.
