I have just upgraded my iphone 4 to iphone 6 and have given my Mum my old phone to use. She is currently on O2 Pay & Go. I have put her sim into the phone but it is currently showing 'No Service' do i need to unlock the phone with O2 or change the settings.
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The phone will be set to contract APN ...settings are different for PAYG
Have a look here at how to change them
*The Game Is On*
Track usage, upgrade and get support with the My O2 appDownload My O2