i would like to encode/convert videos for smartphones.
the problem is screen resolution. each phone has different screen resolution.

well me n my friends have many smartphones like -
nokia n8 - {640x360}
SE xperia mini pro - {320x480}
SE xperia neo v - {480x854}
Htc wildfire S - {320x480}
Galaxy s2 - {800x480}

so i just wanna encode videos which will run in all these phones at HQ full screen.
Also mention if i need any special conversion app ,
& also the conversion settings for HQ videos at small size .
thanx