Hi @Hydrate,
Since you already had an account, adding the phone system is a little different in your case - please see:
Specifically, this part:
If you have an existing number set up with regular phone forwarding or direct VoIP, for example, and would like to switch it to use the phone system instead of ordering a new number, please open a ticket.
We have enabled it from here, and you should be good to go.
Can only answer phone call? Can I use it to receive text message?
You ordered a local UK number. Those don’t have SMS enabled - please order a UK Mobile 44-7 for SMS capabilities.