Welcome to the fire, newguy! I can't help you with the GPS/cell phone stuff but I might have a few other tips for international travel.
1. Let the American consulate know she will be there. At the bottom of that page is a link to registar online with the US consulate in India.

2. Get all her immunizations.

3. Always keep Imodium AD or other anti-diarreha medicine on hand.

4. Keep an upbeat, cheerful attitude.

-Blast