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O2 Sim in Pay monthly Phone

TOMSCOTT
Level 1: Joiner
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Hi

I have a Galaxy S21 on O2 Monthly, which currently is not being used. This phone used to be the old company phone that was supplied to me and we have had upgrades to s23. 

My question is, I have my personal O2 Pay Monthly SIM that I would like to use in the S21, when I set it up, it works for about 10 Mins and then refuses to make calls or text, all the other apps work perfectly and the mobile data is fine, but I am unable to make calls or texts. All the network settings are fine. The SIM I want to use is an O2 Monthly sim only and works fine in my personal iPhone 11. Any ideas why?

 

 

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MI5
Level 94: Supreme
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It's clearly not locked.

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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