Google Calendar - not supporting Airtel

In India, Google Partners with Airtel to provide mobile search services. However, their application Google Calendar doesn't seem to provide support Airtel.

They do support Hutch/Vodafone which incidentally has partnered with Yahoo

Here are the list of service providers that Google Calendar supports -

India

• Hutch-Mumbai
• Hutch-Delhi
• Hutch-Gujarat
• Hutchison Essar Cellular Limited
• Hutch-Kolkata
• Spice Karnataka
• Spice Punjab