If you are using a navigation app that downloads the maps over cellular data, your data usage will be horrendous, no matter what. And you may find times where you will have the location indicator with no map behind it.
My suggestion for long distance navigation is to get a stand-alone GPS device.
For the rest of the question, if the iPhones are unlocked, buy local SIM cards in each country. Isn't that a European requirement that cell phones be unlocked?
Brent
On May 29, 2012, at 9:57 AM, Sanjaya Kanoria wrote:
We are planning to drive from munich to budapest next month. Our iPhones are on the indian carriers Airtel and vodaphone. I'd like to use the navigation and built in maps. What to do to avoid exorbitant roaming charges?
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