I have Problem with iphone 4s battery using 3G with three mobile, someone else?

Has someone got the same problem of me? Since I live in Cardiff and I changed my phone company (I was in Italy before) and I choosed Three mobile, I have really bad battery duration if I use 3G, I can't even use my phone without Wi-Fi 'cause it pass from 30% to 8% in five second of using.
I think is Three mobile issue, I just want to see if someone else has the same problem so I can think to change company.

It's most likely your phone has a bad battery. I would contact apple. If your phone is a certain age, you may still be under warranty and you could send it in and get your battery/phone repaired.

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