wavecom dialing atd no carrier
You're correct regarding the colon, it's dedicated for voice call. Generally, I suggest, that you read either the Wavecom manual or the GSM TS07.07 document for detailed and correct specification of AT commands rather than various websites.
Actually, No Carrier is just an unspecific error message for simple terminal applications, that can't decode detailed messages. The Wavecom manual instructs you to enable extended errors reports by an AT+CEER command, if you want more information. You get a numerical cause, that can be decoded from the manual.
There are many possible reasons for "No carrier", e.g. credit expired, peer not supporting data mode, wrong bearer selected with AT+CBST...