Today I was  comparing Cingular and T-Mobile Plans and noticed that
T-Mobile showed a great deal of the US in the color for no coverage.
When I called them the customer service rep said if I was in an area
where T-Mobile had no coverage, I could just link on to a Cingular tower
if they had one in that area.  She said T-Mobile has a contract with
Cingular for such use.  

Does anyone know if she was giving me correct info and if it really
works like that?  Does it mean I could buy the cheapest T-Mobile Plan
and when out of my state just link on and use Cingular without a charge
to me when I am in areas where T-Mobile has no towers?  

I had no idea trying to choose a cell phone plan could be so confusing
and would appreciate any info anyone can provide as to how this really
works.  I would only need the phone for emergencies and not use it very
often but do want one I can use out of Louisiana when necessary.  Thanks
for any info you can provide.

Bea