HP iPAQ Glisten-AT&T - Manual (Page 141)

Differences between GSM and GPRS/EDGE/WCDMA/
HSDPA technology
GSM technology is typically used for voice calls and text messaging, whereas GPRS/EDGE/WCDMA/
HSDPA technology provides a data connection to the mobile phone network that can be used for web
browsing, multimedia messages, or accessing your corporate network.
NOTE: If data services are used, they are charged additionally to your standard mobile phone
service. Check with your service provider for data services and cost.
If you experience difficulties with your connection, contact your service provider.
Differences between GSM and GPRS/EDGE/WCDMA/HSDPA technology 129