T-mobile no longer allows forwarding to non-10 digit numbers. I ran into this problem a few weeks ago. The idea of forwarding through skype is good. There are many other services that provide this type of service. kall8.com, ureach.com, if you travel to several countries, consider getting a simairways.com sim card. It works with free incoming in many countries, and it is based out of UK, so it isn't a huge cost to forward through there. Of course remember it is not possible to forward directly because tmobile limits it. They say it's due to a system upgrade but I wonder if it's to prevent bypassing their roaming?