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Thanks for your help.
I've found on the internet the GM862-GSM module form round solutions (https://www.roundsolutions.com/gsm/). I think these are the cheaper I've found (€80.00 a piece). I'll get the whole GSM system working (module+antenna+antenna cable) for less than €100. Has anybody had any experience with this module?
have you ever heard "BENQ","SIMCOM",i think these module are cheap enough for you,only $USD 40,less or more,and i have used them to develop some sms applications!!!
if you need any datasheet,i will upload them for u!
by the way:the module type is BENQ M22/M32,SIMCOM SIM110E