I am using a Samsung Exhibit 2 with Android 2.3 Gingerbread. I realized that the APN setup is a little different than with Android 2.2. I also found that with LG G2X the setup is a bit different than with Android 2.2.
APN for WAP should be as follows:
Name: wap (but you can use other names)
Leave all other fields untouched. Do NOT select APN type. I found that if I select APN type, I cannot send MMS.
APN for MMS:
Same as described earlier in this thread.