I have an unlocked 1.0.2 iPhone, running on Orange in the UK.

Orange also have Line2 functionality (the only UK operator doing it I think) which means basically you have 2 phone numbers on one sim card, the only thing you usually cannot do from the line2 number is send text messages on any phone.

I was fully expecting the iPhone to just ignore my Line2 functionality, as other phones do if they don't have the support for it.

However, the iPhone will only dial out from my Line2 number (which isnt the main number I use), but send texts from my Line1 number. When I go into the settings to check, it shows my Line1 number as the main number, and has no option to change anything associated.

I know this is a long shot, but has anyone got any suggestions as to what I can do to try and change the outgoing line number to my main number rather than my secondary line?