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Swap sim

Syfawcett
Level 1: Joiner
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I have given my wife my unlocked a10, she has tried to put her tesco sim in but phone says not registed with network. O2 have told me my old phone is unlatched and needs no code
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MI5
Level 94: Supreme
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@Syfawcett 

Check if sim is inserted correctly and also if it works in another phone.

It should be unlocked but check anyway Guide: Unlocking an O2 phone to use a different SIM card 

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)
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