I don't understand this..it's kind of weird.. i do some tests:

I was able to receive full size image of:

114Kb 768x1024
116Kb 1024x768

but not
30.3kb 640x480
510kb 900x668
215kb 1600x1200
636kb 2576x1448
137kb 1280x960
112kb 1280x960
73.3kb 1072x804
47.5kb 640x480

The thing that puzzle me is the 30.3kb 640x480 or 47.5kb 640x480...why coudn't it display full size?

Also...the ones that received full size show in the header mms version 1.2. And the ones in small thumbnail size show mms version 1.0.