GSM Modems

Wavecom:

data/sms - no voice
Linkwave: http://www.linkwave.co.uk/

data/sms/voice
http://skandikwireless.com/products_gsm.html

VisionTek:
http://www.visiontektele.com/products/modems.html
http://www.visiontektele.com/wireless_modems/gsm_modem_gprs_m2m_82gm.html


http://www.laipac.com/m2m3350.htm