My iPhone 4S keeps loosing signal when 3G connection is on how can this be it worked fine until the latest software update

I recently updatedy iPhone 4S to the latest software now when I have 3G turned on it says searching for network and I can not make or receive calls 02 say 3G has to be turned off but that's the reason I have this phone is to access the Internet when away from home l.  Please help anyone?

Yeah, my iPhone 4S sometimes manages to connect to wifi for about 10 minutes now. I think there is a problem related with the antenna because when the phone heats up, the WIFI stops working. I had a similar experience with my older iPhone 4S which I bought from the U.S.A. (unlocked version) but after a couple of days, WIFI icon grayed out and I wasn't able to switch it on and off. Now the phone I'm using was bought in Turkey from a local carrier, (it's not locked I suppose) I'm planning on upgrading to an iPhone 6 and I will try to get my 4S repaired. I hope it is something related with software rather than hardware. Because a friend of mine sent his phone to the local Apple store to be fixed, they sent the phone back claiming that they had repaired it. But in about 2 days, the phone shut itself down and never turned off back again lol. I don't want to experience the same thing. But anyway, thanks for your answer. At least now I know that I'm not the only one that has this problem .

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