iPhone 5s with service then no service
Hello i bought iPhone 5s few days ago..when i turned on iPhone i had service for about few minutes the i lost it and it keeps "Searching" or "No service"..when i eject sim card and enter it back it finds signal again..but after 2 times of ejecting sim card the iPhone just keep on "Searching and No service"..sometimes i try reseting network settings and it works sometimes but not always..When i turn off my phone for about a half hour and turn on i get signal again and lost it after some times..its so frustrating,i tryed restoring mobile and it also work for few minutes..When i got signal i tried to talk with my friend and sound quality is excellent..I tried reseting network settings,recovering my phone,trying other sim card,heating up the mobile with fan (It worked when i tried to install iOS,i was always getting -1 error)..Does anybody knows what maybe can be?
Is this a good question?