Thai state-run telco TOT has agreed to allow the country’s market-leading cellular operator Advanced Info Service (AIS) to offer 3G data services over TOT’s 2100MHz network in the Bangkok area, in exchange for providing TOT’s customers voice roaming across AIS’s nationwide 2G network. The Bangkok Post reports that TOT, the country’s sole 2100MHz UMTS licensee, has agreed to allow 50,000 AIS mobile numbers to roam on the 3G network for data services, while in turn AIS will let 200,000 TOT numbers access its national GSM services. The proposed bilateral deal will be on a six-month trial basis, effectively making AIS the sixth company cleared to operate as an MVNO over TOT’s third-generation network. Previously the five existing MVNOs objected to proposals to give up to 100,000 AIS subscribers access to TOT’s high speed services, arguing that demands on network capacity would be too great. Thailand has scheduled an auction of full UMTS operating licences to privately-owned cellcos in late September.