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Can't use O2 sim - help please!

innovate
innovate Posts: 16,217 Forumite
10,000 Posts Combo Breaker
I've searched the forum high and low but couldn't find an answer to my problem.

I have my own handset, in which I currently use a T-Mobile SIM which is on a UFix tariff. Before the T-Mobile SIM, I used a BT SIM, and I could simply replace the BT SIM with the T-Mobile one.

I now want to use one of the free O2 SIMs in my handset but I get a message "Please use a correct SIM card". This happens with two separate O2 SIMs, both of which I got about a month ago but have never used so far.

Anyone know what the problem might be? Have T-Mobile locked my handset to their network?

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