I have received a CTT text message saying my delivery cannot be delivered due to additional charges. I have ordered nothing. Is this something me sort of phishing or virus message?

Yes.
I get lots, usually as emails. Notice that neither your name nor address is on there; just "dear customer".

I get them from all the courier services too. Well, not really because they're all fake.

Real notices have your name and a tracking number at least.

Every genuine text I receive from CTT has the tracking number included. Definitely a scam, similar ones were doing the rounds in the UK a few years ago (probably still are)!

Yes, I have also received a CTT message. The problem is, I have ordered something but the 'Dear Customer' bit and no tracking doesn't ring true.