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I have an iPhone 4, which I bought in Europe. It worked without any problems with a Vodafone SIM. I relocated to Singapore and I am now with Singtel. Since the shift I am facing a lot of problems: Battery run down, issues to call, network issues etc.. A lot of my colleagues with iDevices are also facing these issues.
I think Apple has clearly a SIM problem, which might be related to the battery problem.
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