No, not spam.
Explained here https://community.o2.co.uk/t5/How-to-Guides/All-you-need-to-know-about-O2-Voicemail-901/ba-p/547712#...
O2 Call Alert
What is it?
O2 Call Alert is a simple, easy-to-use alternative to Voicemail 901. It provides missed call information for up to four callers, at no extra cost, by sending you a text message update.
So, if you're on another call or your mobile's switched off, if you're out of coverage or you just don't answer in time, O2 Call Alert will tell you the caller's number and the last time they called.
But it's not just you who benefits from the service. Callers also hear a message telling them that their number's being sent to you via text message, to let you know they called. (Although, if anyone decides to withhold their number, you won't be sent the missed call text and they'll be told to call again later.)
How do I switch it on?
You can turn on O2 Call Alert any time by calling 1710 free from your mobile phone. And you call exactly the same number to switch it off.
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I just wanted to check if you got all the info you needed and if you have any further questions the community could help you with?
