Thanks for getting back to me. It's still not working. I think it's an automated text that the Xiaomi Sim Activation Service sends. I've put a £5 spend cap on my plan so it should be able to send a 30p text without restriction.
For the life of me I can't see what they are playing at but have you tried via the Web
Activate from the Xiaomi website
It is a trick that allows you to activate the card, when we have had a problem with the account and its registration. To do this we go tohttps://account.xiaomi.comand enter our username and password. Then we will have toclick on Security and write our phone number. Then we click on edit and wait to receive a verification code that we must enter on the web. If we receive the message, the activation will be successful
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