You can use Oxygen SMS ActiveX. I tried its demo but it has no royalty free so you have to pay for your every client to Oxygen and I didn't use it about that issue... Otherhand it easy to use... I tried Nokia's developer suite. It can use with delphi or VB. But in VFP I have some troubles with it. So I couldn't use it. At below I list my sample (I found that sample at internet don't my written sample) app. I got errors about OLE:

LOCAL  CellNum
LOCAL  TextMesg
PUBLIC CommErrorRetries

CellNum = '353863982273'
TextMesg = 'TESTING NOKIA DATA SUITE'
CommErrorRetries = 0


objSMS = CREATEOBJECTEX('SMSAdapter.SMSAdapter.1','','')
objMess = .NULL. && objMess is initially a boolean with value = .F.
objSMS.CreateShortMsg(@objMess)

objMess.UserDataText    = TextMesg
objMess.OtherEndAddress = CellNum
objMess.SCAddress       = CellNum
objSMS.Send(objMess)
objSMS.Terminate

>Hi to all
>
>I need to create an application for cell phones. Anyone here that can share some experience?
>
>Thanks
>Willie