How To:Unbrand Lumia 920 to 8.1 + get ICS and MMS on Straight Talk - Nokia Lumia 920

I've put many hours trying to get this figured out on my AT&T RM-820 running Straight Talk on AT&T towers, so I'm not going to give all the details, but I wanted to help others out who are in my boat.
1) Follow the directions to get to the Rogers ROM.
2) Upgrade to the RM-821 French ROM
3)When it boots and asks which Access Point, select LTE2
4)Add the straight talk APN & MMS info by opening access point again and setting them up
5)Reboot
6)Test MMS (not ICS - internet connection sharing)
7)Reboot
8)Install the Spanish – Spain keyboard
9)Reboot
10)Test ICS and MMS
11)Do all win 8.0 updates via regular update method
12)Reboot, test MMS and ICS
13)Then get the developer preview updates – 1 at a time
14)Test ICS and MMS
15)Reboot
16)Test ICS and MMS
17)Set date to at least 2116 if not higher
18)Try to open “access point” in settings – it will fail – uninstall it
19)Test ICS and MMS
20)Check for more developer updates, repeat
The moral of the story that I learned is that you probably can't change MMS or APN settings after you do this. If you launch access point at any point after the point that I said above, it downloads the message saying you need to call 611 or go to att.com to subscribe to tethering - but since this isn't AT&T service, you can't do that. Never open access point, and if it ever shows up on your phone, set the date to 2116, and launch it to remove it so you never bump it in the settings - I learned the hard way thinking "I'll just never open this". I know there are lots of reboots in there - way more than you need, but I like to be careful.

---

mms is easy ics dont know
speertp said:
I've put many hours trying to get this figured out on my AT&T RM-820 running Straight Talk on AT&T towers, so I'm not going to give all the details, but I wanted to help others out who are in my boat.
1) Follow the directions to get to the Rogers ROM.
2) Upgrade to the RM-821 French ROM
3)When it boots and asks which Access Point, select LTE2
4)Add the straight talk APN & MMS info by opening access point again and setting them up
5)Reboot
6)Test MMS (not ICS - internet connection sharing)
7)Reboot
8)Install the Spanish – Spain keyboard
9)Reboot
10)Test ICS and MMS
11)Do all win 8.0 updates via regular update method
12)Reboot, test MMS and ICS
13)Then get the developer preview updates – 1 at a time
14)Test ICS and MMS
15)Reboot
16)Test ICS and MMS
17)Set date to at least 2116 if not higher
18)Try to open “access point” in settings – it will fail – uninstall it
19)Test ICS and MMS
20)Check for more developer updates, repeat
The moral of the story that I learned is that you probably can't change MMS or APN settings after you do this. If you launch access point at any point after the point that I said above, it downloads the message saying you need to call 611 or go to att.com to subscribe to tethering - but since this isn't AT&T service, you can't do that. Never open access point, and if it ever shows up on your phone, set the date to 2116, and launch it to remove it so you never bump it in the settings - I learned the hard way thinking "I'll just never open this". I know there are lots of reboots in there - way more than you need, but I like to be careful.
Click to expand...
Click to collapse
for mms you just enter the following and I have had no issues
under sim settings enter edit mms apn
apn = tfdata
authentication type = PAP
WAP gateway = 66.209.11.33
WAP gateway port = 80
MMSC = http://mmsc.cingular.com/
MMSC port = 80
everything else blank
internet apn settings
APN = tfdata
everything else blank Authentication type PAP
hope this helps someone

---

ICS
This post pertains more to Internet Connection Sharing - you can certainly add the APN and MMS info to get that working. BUT if you want to be able to turn internet connection sharing on, you have to do this.