If you have noticed your iPhone 5 goes into "No Service" and cannot connect to network, you might want to try to disable LTE.
Go to Settings -> General -> Cellular -> Enable LTE -> Off.
It happened to my wife's iPhone, and I almost wanted to bring the phone to service centre, but after searching online, I tried this method and ever since then, the connection has been fine.
Thanks for sharing this with the community.
This method works initially, but when I turn off LTE, I usually do not get 3G network.
I get a small "o" , and the speed is very bad, and almost zero connection.
I cannot even send message and check mail.
And this happens almost most of the time.
I have already changed the SIM card, and still having this problem.
I am still on the 3G plan and not shifted to 4G plan yet
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