in any mobile devices (like cellular/smartphones) i have not experience a poor signal (whoever the manufacturer is) except if the issue is within the service provider.

in the case of my n900, i do 90% of non-telephony stuff on it since last month.

it was my primary phone, but it always pisses me off if someone calls when im doing something with my n900 (Grrrrrr!!!!!!) like playing angry birds, or doing something via x-term, so i decided to switch the sim card of my other phone with my n900. and now, no one can disturb me playing with my n900!!!!!!!!!

and yeah, i agree with ysss with my statement above. maybe the n900 is too smart to be a phone.