In case you've just done this: FlashAnOrangeSPVC600WithTheImateROM, Here's how to get data services working (MMS being the real bitch) on a newly flashed C600, for Orange UK. This probably applies to other WM5 devices for Orange UK.

In case you're curious, if you request these details through the orange site via Sim update, the phone backlight comes on as the message comes in, then nothing at all happens. This is okay, as we hacker bitches are down with doing things manually, and scouring forums all day to find information. Luckily for you, I have been the hacker bitch for the day, and saved you the effort. Enjoy.

1) start, settings, connections, Dial-Up
2) Menu, new, enter details as follows:

Name: Orange CSD Wap
Connects To: The Internet
Phone Number: +447973100500
Username: Orange
Password: Multimedia
Domain: (leave blank)

3) Back up to Connections, go into GPRS
4) Make 3 (three) connections, details below for each:

Name: Orange GPRS
Connects To: The Internet
Accesspoint: Orangeinternet
Username: (leave blank)
Password: (leave blank)
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP Address: (leave blank)

Name: Orange MMS
Connects To: Secure WAP Network
Accesspoint: Orangemms
Username: Orange
Password: Multimedia
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP Address: (leave blank)

FINGERS BLEEDING YET? BUT GEOFFRY, THE FUN HAS ONLY JUST BEGUN...

Name: Orange WAP
Connects To: The Internet [this probably could be WAP Network instead, but in a land of GPRS, who gives a pigeon]
Accesspoint: Orangewap
Username: (leave blank)
Password: (leave blank)
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP Address: (leave blank)

5) Back up to connection settings, go into Proxy
6) Menu, new, details below:

Name: Orange WAP Proxy
Connects From: The Internet
Connects To: WAP Network
Proxy: 192.168.71.35
Type: WAP
Username: (leave blank)
Password: (leave blank)

7) Back out to the start menu, go into Messaging
8) MMS, Menu, Options, Account Options, MMS (didn't we choose that earlier? yes i thought so too Microsoft, never mind, 5 level deep menus are F-U-N)
9) Configure this lot mostly how you like, mine is set up thusly:

Retrieve Immediately: yes
Download on home only: no [Might be worth setting this to 'yes', in case you're abroad and that MMS of Doug's bum your girlfriend's boobs ends up costing you £18 - ElRobbo]
Save sent messages: yes
Reject all: no
Allow delivery report: no
Allow read report: no
Attempts: 1
Resolution: original resolution

10) While still on this page, go to Menu, MMSC Settings
11) Delete the default, add a new one:

Name: Orange UK
MMSC URL: http://mms.orange.co.uk∞
WAP Gateway: 192.168.224.10
Port: 9201
Connect Via: Secure WAP Network
Max Sending Size: 250k
WAP Version: WAP 1.2

DONE!

November Fool! The above is only half the fix. Let's proceed...

12) dowload this reg editor∞, copy it over to your phone somewhere, then execute it via File Manager (or create a proper shortcut to it in your phone's Start Menu via ActiveSync's Explorer if you plan to regularly hack shit up).

13) Navigate to HKEY_LOCAL_MACHINE\Comm\ConnMgr\Providers\<GUID>\Connections\Orange MMS, where <GUID> is the one that actually contains those child keys. You'll find it, don't worry. It might be 7C4B7A38-5FF7-4bc1-80F6-5DA7870BB1AA, if you followed the steps above to the letter, case sensitive and all.

14) Look at the values under this key. There's a String called DestID, which holds a GUID that you need to write down now.

15) Back up out of this key and go to HKEY_LOCAL_MACHINE\Comm\ConnMgr\Destinations

16) Make a new key called "MMS Connection", if it doesn't already exist, which it shouldn't unless witchcraft has occurred. Call your nearest bishop if so, using reference codeword WITCHY. He'll know what to do. He's trained.

17) Under this key, create the following values:
String "Default" : "Orange MMS"
String "DestId" : <the GUID you wrote down from the provider above>
DWord "Secure" : 0

18) Exit regedit and go into Settings > Connections > GPRS > Orange MMS, and change "Connects To" to "Orange MMS".

That should be it. Praise be to Barcelos∞for finding the relevant reg keys on his vanilla C600.