Ok, I fixed it. I followed the directions below which I got from the thread started by the great "
INTREPID-NY" that I linked to above. It didn't work at first so I made a slight modification to his instructions and now I can send/receive MMS. Follow his directions first. If that doesn't work, you can substitute my Step 5 below instead of his Step 5. Good luck, no guarantees this will work for you. (Again, the culprit is the Quick Settings App so I suggest deleting it after you fix this. I'm not sure if Quick Settings must be installed on your phone for this fix to work. I reinstalled it before doing this fix.)
Before you Begin: You
must have a MicroSD card installed. You
MUST have Windows configured to show extensions of known file types! Do not proceed until you're sure you can see extensions of files. See here for simple instructions on how to show extensions in Windows:
http://www.tacktech.com/display.cfm?ttid=193
1) Install APN Backup and Restore from the Market (free)
2) Run the App and select Backup. Name the file: apns-broken.xml
3) Plug Incredible into USB (or remove card) and copy the file on your phone's sdcard from folder called APNBackupRestore to your pc.
4) Open the file on your pc in a text editor such as notepad.
5) Remove the 2 occurrences of [disabled] - see below for example.
My Step 5: Erase everything you see in the file and then cut & paste the "APN After Editing" sequence seen below. (Click on File and then Save, not sure if this makes a difference but I did it.)
6) Save the edited file as: apns-fixed.xml
7)
Verify your can see the file extension of the file as .xml
8) Copy the file back to your sdcard into the same folder called APNBackupRestore.
9) Run APN Backup again and click Restore. Select the file to restore: apns-fixed.xml - When prompted to search for all instances, answer:
NO
10) Unplug your phone from USB and reboot your phone.
APN Before Editing
bolded entries will be removed
==============
<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<apns>
<apn name="Production" numeric="00000" mcc="000" mnc="00" apn="1
[disabled]" user="null" server="null" password="null" proxy="null" port="null" mmsproxy="null" mmsport="null" mmsprotocol="2.0" mmsc="
http://mms.vtext.com/servlets/mms" type="mms
[disabled]" />
</apns>
APN After Editing
==============
<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<apns>
<apn name="Production" numeric="00000" mcc="000" mnc="00" apn="1" user="null" server="null" password="null" proxy="null" port="null" mmsproxy="null" mmsport="null" mmsprotocol="2.0" mmsc="
http://mms.vtext.com/servlets/mms" type="mms" />
</apns>
=============
Note: If the word "null" is missing after your restore and check the apn again, that is ok. For example: password="null" and Password="" are both acceptable. Sometimes Android will remove the word "null" when restoring.