I'm willing to bet its just the Skype answering service. I added a friend from Kenya today and then received this number calling me. It was probably her calling me. I wouldn't freak too much.
I went to my PC skype program, placed these #s to the reject list and on my droid I marked receive calls only from my contacts. So far it worked, try it
I have Skype on my phone and used Skype on my comp. To call my sis. This phone number just calls because you used a separate Skype not on ur phone...its a Skype call nothing to worry about ppl...does it all the time only if ur using Skype.