Apple 5s upgrade ios7.1.1 no signal? iphone5s Update ios7.1.1 no signal solution

IPhone5S upgrade ios7.1.1 After no signal this problem is mostly with mobile card machine, and then try to press the home key and the Power-on key method to restart, still "no service." Resetting the network settings is also invalid. Even more annoying is that the SIM card was originally thought to be loose, the SIM card removed and then inserted, still failed to solve the problem. At his wits ' tips, he suspects it is the problem of a telecom SIM card, but puts his telecom card in the iphone5s of a small series of signals. The colleague desperately thought his iphone 5S was broken, but the signal came back when he put the card back in his iphone5s.

In fact, the reason is to use the relationship between 4G, if you are located in a big city 4G coverage of good signal full lattice, poor coverage of the signal is very bad electricity. Workaround: Turn off the 4G in a cellular mobile network, and the signal will be better. A better way is to download a mobile flow meter, which is available in the App Store, and locks the network to a 2G signal at the full grid. No 4G users proposed to move to open 4G, the signal immediately stable.

If you can't, you can go to ' set '-' phone '---turn off ' dialing power ' then shut down, pull out the SIM card, then power on, plug in the SIM card, and finally enter ' set '---' operator '----close ' auto '----choose ' mobile '.