http://www.didx.net has several thousand telco and voip company wholesale members with a goal to buy and sell DID and DDI phone numbers. The most recent request is for Co-operative Republic of Guyana DID phone numbers. Requesting wireless and wired telcos and voip companies with this to contact firstname.lastname@example.org with Co-operative Republic of Guyana in the subject line. This is wholesale level only. See http://www.didx.net/interop to understand the terms and interop testing steps to get an instant interconnect with thousands of other service providers for origination (DID/DDI).
BTW, for the trivia buffs...
Telephone Systems in Guyana
Telephones: 110,120 main telephone lines (2005)
Telephones mobile cellular: 281,400 (2005)
General Assessment: fair system for long-distance service
Domestic: microwave radio relay network for trunk lines; fixed-line teledensity is about 15 per 100 persons; many areas still lack fixed-line telephone services; mobile-cellular teledensity reached 37 per 100 persons in 2005
International: country code - 592; tropospheric scatter to Trinidad; satellite earth station - 1 Intelsat (Atlantic Ocean)
... browse some of our team's other blogs at http://blogs.didx.net and http://blog.tmcnet.com/monetizing-ip-communications/. Find out how to get your telephone company to offer phone numbers from around the world. You're welcome to comment, contribute, and collaborate any time.