Thanks Marvin for suggestion, Not exactly as you suggested (I hope it is not a problem) I got some data’s from (Windows) Device manager – there is the chipset identification - if it helps something. Zoltan ATQ0V1E0 - OK AT+GMM - +GMM: ES56H-PI AT+FCLASS=? - 0,1,8 AT#CLS=? - COMMAND NOT SUPPORTED AT+GCI? - B5 AT+GCI=? - +GCI: AT+(B5,00,04,B4,3D,0A,59,09,A5,31,7E,61,26,9C,6C,9F,8A,2E,51,50,AE,A0,B3 ,0F,3C,46,52,7B,69,82,B5,8B,B5,A4,A9,88,58,1B,07,73,B5,20,16,57,B5,62,98 ,36,AD,77,0C,53,54,25,6A,1A,89,2D,68,70,B5,27,49,8C,BB,14,35,84,85,BC,37 ,4F,33,87,B7,4E) ATI1 - ES2839 ATI2 - RXF2-V90A ATI3 - V4.43.049-H-PI ATI4 - ESS Technology, Inc. ATI5 - ES56H-PI ATI6 - OK ATI7 - OK No virus found in this outgoing message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.22.9/1364 - Release Date: 7.4.2008 18:38