My friend is overseas in Singapore and is calling me through skype.
Does anyone know if the calls I recieve from overseas VOIP calls are charged?
No. Skype billing has nothing to do with FiOS. Skype to Skype calls are free, if you call someone to a landline/cell you would need credit. You should read up more about skype on their website...
http://skype.com/newtoskype/