Zer01 Mobile announced today that it has signed an agreement with Buzzirk Mobile, Inc. to provide unlimited voice and data mobile wireless services for Buzzirk Mobile subscribers starting in July 2009. The mobile service will also be marketed through Global Verge, a mobile virtual network operator for Buzzirk Mobile. Creating interconnect agreements throughout North America and the globe, Zer01 Mobile is the first mobile service to offer…

Zer01 is taking on AT&T (NYSE: T), Sprint (NYSE: S), T-Mobile, and Verizon (NYSE: VZ) Wireless by offering unlimited voice, text, and data plans for $69.95 a month with no contract or credit check.

The company is able to undercut the competitors by using a voice-over-IP client on the handset for all voice calls. This is made possible by interconnect, or roaming, agreements to use AT&T’s and T-Mobile’s networks to tunnel to Zer01’s IP backbone. For an extra $10 a month, users also will be able to make unlimited…