bisnisonline2008 wrote an interesting post today on
Here’s a quick excerpt

Cellular Phones a. Code Division Multiple Access (CDMA) - Typically handset only b. Global Systems Mobile (GSM) - Handset and SIM c. Integrated Digital Enhanced Network (iDEN) - Handset and SIM. Portable Digital/Data Assistants (PDA’s) …

Read the rest of this great post here