I had a hard time trying to make the G1 work with Etisalat’s network. After several attempts to make it work, I finally got the right combination of settings. Here is the setup:

2 APN should be created: (Settings -> Wireless controls -> Mobile networks -> Access Point Names -> (MENU) New)

Etisalat:
Name: Etisalat
APN: etisalat.ae
APN type: Default

mms:
Name: mms
APN: mms
username: mms
password: mms
MMSC: http://mms/servlets/mms
MMS Proxy: 10.12.0.30
MMS Port: 8080
APN type: mms

This should get both 3G and MMS working. It will allow you to send and recieve MMS.