United Mobile+ (new service with +44 Jersey number)

[Przemolog]

Originally Posted by UKSTEVE

If all else fails than you can try to make telephone calls using an USSD-command: Please dial *137*Countrycodes without "00", Areacode without "0", phone number and at last the pound sign (#).

Example for London/UK: *137*442072xxxxx#

If you have further questions, do not hesitate to contact us again.

That's great that they revealed the USSD code behind the callback SIM application

It helped with the lack of callback when roaming on Era Poland - with the code above it works!