hey guys I was just wondering does anyone else have this same problem:

I have two phones the nokia n900 and my work phone blackberry 8700 (oldy), when out and about they work fine but when I get onto a train aka the underground they both loose signal (duh), but when I resurface say at an outside part of the line the blackberry instantly gets signal and works fine but the nokia just takes forever!

When I exit the subway to it takes at least 3 mins for the nokia to even get one bar its madness! has anyone else had this trouble or does anyone know of a antenna booster I can use on the phone?

oh and both phones are on the same network.

Thanks guys