Unable to use call facility since switching to Sky Mobile

[Hazdou]

I transferred network and should all have been done by 26 November, everything seems ok except I cannot make calls, any ideas

[Hazdou]

Sky chat was not helpful and obviously cannot phone as that's the problem

[twilight+princess]

Did you keep your number from the old network?
Have you downloaded the Sky settings to your phone &/or reset the network settings?