I successfully configured the device for SMS, but not GRPS yet. I have the GPRS disabled.
My biggest concern, however, is enabling the OVMS device to be recognized by the ATT Microcell at my house. Cell service in the garage is limited. I have succeeded in registering the associated phone # with the microcell so that it recognizes it but have not gotten it to work.
The question (finally) is --- is the OVMS unit 3G compatible, since that is a Microcell requirement.