IPhone 5s doesn't often connect to 3G/4G

Hi,
I have an iPhone 5s but it rarely connects to the o2 network (3G/4G etc). Wi-fi connection is fine, and I CAN connect to the network at times but I almost always need to switch flight mode on and off for the phone to even try. It also seems to forget to keep trying to stay connected after a while, which is really inconvenient.
The flight mode trick is a good workaround but gets pretty frustration paying £50 a month but not really being able to use data very often or easily. The Genius Bar people did the usual and said I should update, back up, factory reset etc (all of which I'd already done). Didn't help at all.
Any ideas?!
Thanks

Appreciate you trying to help,  but your answer wasn't helpful and it sounds like you didn't really read my question.
I CAN get network signal, but left to its own devices, my phone doesn't pick it up. I always have to 'jump start' the connection by switching flight mode on then off. It's NOT a network issue but a problem with the phone itself - I can stand perfectly still, have no signal at all, the. Do the flight mode trick and instantly i get 3G/4G.
Thanks

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