[GeoffN]

In order to find out how much pre-paid phone credit I have with my carrier, I can dial #123#, which works with my SIM in my iPhone (unlocked) and I get a response giving my available credit. However, when I try to dial this combination of digits with the same SIM in the Lumia 800 (unlocked), I always get the message 'failed'. Can anyone suggest how I might dial #123# on the Lumia? Thanks

[Kosh]

Hi GeoffN,

Usually service codes are in the format *[number]#

For instance by dialling *100# on my Lumia 800 I will get my calling credit with my carrier.

Hope this helps,

Kosh

[GeoffN]

Thanks, but that doesn't work either; just returns 'wrong format'.

[verjic]

Hi Kosh, I have this problem too with my nokia.
If I dial *115# at my carrer I recieve my credit info but after I dial this service code I recieve the info in 2-3 min ! I use my sim with iphone and there I have response in 3 sec.,
Other service code is *100#, if i dial it i can choose different servie from my career. It also took 2-3 min to appear the menu, but after the menu appear, i can't choose from menu any option. there is just ok button and thts all. how to proceed?

[KennyKB]

It's not the phone's problem. WP7.5 doesn't support USSD codes.