My iphone4s keeps saying no service,i downloaded the new software 5.1 but it still doesnt get service!!!what the ****???my iphones only give me problems???help apple!!!

I have had an iphone2,iphone3gs and now i have the iphone 4s for about 8 weeks,first my battery got extremely hot and then i had to regularly reset the network settings to get a decent edge or 3G connection.
now since i have had the phone it has jumped between edge and 3G to the point of me wanting to throw it against a wall,but the last week i have had the phone jump between between no service and edge signal(mostly no service)so here is a list of everything i have done but its still not working:
1)reset network settings
2)reset entire phone from general settings
3)hard reset from pressing home and lock button simultaneously
4)loaded new ios5.1
5)fooled around with every possible setting putting it on and off checking for signal
6)and no,its not my sim,its a brand new microsim.
i got some signal this morning when i put the 3G off(because you can now do that with new ios5.1) long enough to download an app from the i store(i had to because when i tried to open up an app from my home screen it doesnt open,looks like its about to open then just closes itself immediately.
does anyone else have these problems,im frustrated with this,im a looooong time apple and mac user but im getting fedup right now,istores are also clueless...

some more info which would most likely help...
i am in south africa and currently on the mtn network,network is fine as no one else is experiencing internet problems.
also currently after doing everything i could think of,my iphone 4s is now just saying searching constantly....no service whatsoever no matter what i do.
super fruuuuuuussssstratiiiingggggg!!!!!!!!!!

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