The ‘>’ prompt tells you that the unit has accepted the initial parameters, and is ready for you to enter the body of the message.
This is implicit in the description provide in the Wavecom AT Command manual, but Siemens add the following explicit note in their documentation:
The GSM spec says:
The implication in “after that text can be entered” is, of course, “before that, text cannot be entered”! 8)
All the GSM Specs area available for free download at: