Network Rejection Cause- phone not allowed MM#6

[AndyGS]

Purchased a refurbished sony xperia from O2 online shop. Put an an O2 pay as you go  SIM Card into it and Im getting Network Rejection Cause- phone not allowed MM#6 , as if its locked to another network.

Can anybody help?

[MI5 · Accepted solution]

@AndyGS 

It's either locked or barred. 

Unlock here Guide: Unlocking an O2 phone to use a different SIM card but I would also check IMEI number online. 

Numbers to call O2 on here Guide: Coronavirus Community Help and Support 

[liggerz87]

https://joyofandroid.com/how-to-remove-phone-not-allowed-mm6-error/#:~:text=If%20your%20device%20is%.... Just found this if get in touch with o2 sounds like someone kept the o2 phone and then sent o2 the one you got or could be from o2 recycle @Martin-O2 do o2 sell the phones from o2 recycle a d out them on the site as good as new

[MI5]

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@liggerz87 wrote:
https://joyofandroid.com/how-to-remove-phone-not-allowed-mm6-error/#:~:text=If%20your%20device%20is%.... Just found this if get in touch with o2 sounds like someone kept the o2 phone and then sent o2 the one you got or could be from o2 recycle @Martin-O2 do o2 sell the phones from o2 recycle a d out them on the site as good as new

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That just means it's locked to another network as mentioned above.

[liggerz87]

ah ok