I wonder if it's a hardware or just a driver issue. I expected the E51 to have a much weaker wifi since it's smaller, so there's less space for an antenna. And the N800 has stronger power source and it's main communication way is the wifi. But I was wrong.

I'm sitting in my room, there's a router near the entrance (two walls and about 12-15 meter). The E51 can connect to it, but drops it afterward, the N800 can't even connect.