Hi Bruce,
Are you using Wintex to program the panel? If so, in the Communications Options make sure the Enable Communicator box is ticked on the Options Tab.
On the ARC's tab, Enter your mobile number in the Primary Telephone number box and select SMS Messaging in the Protocol drop down options.
On the same tab, select which areas you want text's to be received for and select the events you want to receive text's for in the Reporting Options.
On the Radio Pad and Com Port options tab, enter the phone number of your Mobile providers's SMS service centre in SMS Call Centre 1 or use the Open Tap
service, who's number is 07045607101. The cost of using Open Tap is 50p a txt but it tends to be much more reliable than the mobile operator's own service centres.
Still on the same tab, make sure Com2400 Module is selected for the Onboard Digi Com option.
Hope that helps a bit!
Brian