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    Sim pin

    Thank you. I had already read that but still don't know if its advisable to enable it. Does it mean that I would have to enter the pin before making a call?
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    Sim pin

    I have a passcode lock enabled on my phone but have read somewhere that I should also enable a SIM pin. Is this correct, please?
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    Group contacts

    When my husband opens Contacts on his iPhone, Groups are shown top left. On mine, only the Refresh arrow shows. As far as we know, he does not have any Groups, so why does this show and how to we get rid of it?
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    No wifi connection

    iPhone replaced. Faulty Wifi chip.
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    No wifi connection

    Yes and all other devices are working correctly. Will take the phone into O2 on Monday!
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    No wifi connection

    Tried those suggestions. No result. Done a complete Restore via iTunes but still no wifi.
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    No wifi connection

    When I switched my phone on this morning, there was no wifi connection and the wifi button is greyed out. I have tried putting plane mode on and off, and have tried switching the phone off completely and then on again. Another iPhone, and my iPad, is connected as usual to our home network...
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    Battery life

    Thanks for your reply. I have been using Battery Doctor for full charges, including the trickle charge, but it has not made any substantial difference.
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    Battery life

    When I upgraded to iPhone 4S, the battery life had improved from the 3GS. However, after about three months, the battery seems to need charging more frequently. I close down apps I am not using and I've not increased usage in general. Has anyone experienced anything similar and is there...
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