For any questions about your TalkTalk mobile service.
Thursday
My phone is not connecting to UK no.s from canary islands. I have had text from local network which suggests everything is ok?
Thursday
Did you call Talktalk to set up roaming?
Otherwise you may just be connecting to the local network.
See these pages, @Sunwing:
https://community.talktalk.co.uk/t5/Articles/Using-TalkTalk-Mobile-abroad/ta-p/2204471