general GPRS question

[raywright1]

I'm having a hard time understanding why the GPRS vendors are making a distinction between email, internet, and WAP services. I've even looked through some configuration instructions and notice IP and authentication differences based on the service. Furthermore, it's not even clear what each service actually entails.

Can someone give me an overview of these differences? Maybe I can deduce the reason for configuration and billing differences if I understood the distinction in service.

My primary GPRS interest is using an email client for IMAP (although contacts/calendar synchronization via ActiveSync would be desirable too). What key terms and phrases should I look out for in order to get the service I need as I research the prepaid and postpaid options by country?

Thanks in advance.