Selling iphone 4?

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Hi,

I have an iphone 4 on contract with O2. If i gave my phone or sold it to someone else, would i need to unlock it or could they put any sim in it and use it as normal?
 

chscag

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2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
You need to direct that question to O2 there in the UK. Here in the US they (with our current iPhone carriers) it's not necessary to unlock the phone first.
 
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13" Late 2011 MBP,iPad '3' 32gb,iPhone4 32gb
You'd need to unlock it, if you were wanting to put anything other than an O2 sim card in.
 

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