QUOTE(davidmak @ Aug 22 2007, 04:08 PM)
The SIM and USIM card are meant to be backward and forward compatible. As long as the telco side has activated your account to use 3G services, any SIM card will work.
The only difference with the USIM card is UMTS authentication and encryption.
I agree that the frame rate of the video call (hence, how smooth is the video) is dependent on the network strength. At higher network strength, the effective data rate will be higher as well. Clarity however also depends on the network because your image have to be transported to the other side of the call, going through the network. A higher effective data rate will of course guarantee the minimal loss in data.
Assuming that we have the full theoretical data rate, of course phone lens (though I think its minimal) will at some point improve images. The secondary camera at the front of the phone is the usual 330K (up to 640x480) CMOS sensor running at maybe 15fps or lower depending on signal quality. Meaning at each second, the sensor will feed 15x (or lower) 330K images to the phone's transceiver.
On the other hand, the primary camera at the backside of the phone is a Cybershot compliant 3.2MP camera. Thats a 2048x1536 resolution thats maybe 200-300kB of data per frame. At 15fps it'll be enormous. So I doubt thats the case. If the 3.2MP camera is usable for 3G Video Call (I haven't tried this before), its actually sampling images at a smaller resolution, near 330K. There's no special lens here in the K800/810, but I doubt Carl Zeiss lens would do any difference on a phone. One point to note although at IMAGING MODE the K800/810 is able to take pictures at 3.2MP, in VIDEO MODE going through the same lens and same sensor its only outputting video at 320x240@15fps which is way smaller than 3.2MP.
So my point is, do not expect 3.2MP performance and hence a better video call from the backside camera.
I will reply point by point to your post ok ?
Any sim card will work but not for his old sim card as stated by him right ? He do mention that he change to
3G sim card then only the blue 3G icon appear.
K800/K810 video call camera is only 0.1MP if I'm not mistaken.
It is possible to use the 3.2MP lens to show the another half of the video call user.
FYI, K800 and K810i snapping video only at
176*144 not 320*240 as stated by you. And K800/810 not using Carl Zeiss lens.