Sanyo

I have a question about the GPS Navigation system on the SCP 2700 phone. It allows you to store addresses as "Favorites" but all the addresses stored there automatically delete every so often! Is there a way to store them PERMANENTLY? It's really inconvenient to think you have an address stored then get in your car to go to that place and see that its gone... then have to go look it up again.

Is there like a guide to using the GPS on this phone, either online or in print somewhere?

Thanks