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If you an error message when inserting your TalkTalk mobile SIM card, please follow the steps below to help resolve the problem.
All TalkTalk mobile handsets are compatible with our service. If you are a SIM only customer and you receive this error, the handset you are trying to use with your TalkTalk mobile SIM card may be locked to another network. For details on how to unlock your handset please see Can I use my existing handset with a TalkTalk SIM card.
If after following these steps you are still receiving the error message, please call Customer Service from another phone on 0870 087 8751 who will be happy to help.