SG550M/580M has the capability to send 640x480 images (always!) to email/phone since october 2011.
The upgraded SG550M-8M can now send 800x600 to email (640x480 to phone) via MMS and GPRS with improved success rate, plus the long range detection/illumination and and high quality 8MP resolution.
How do you get an upgraded on?
On January 6, 2012, I emailed HCO and asked them about this. Here is their response:
There is no firmware update that allows the SG580M to transmit larger pictures. You can choose the number of MPs you want for the photos and they will be stored on the SD card in that size. But the photos are sent at a lower MP (than what you set in the camera) to your phone, otherwise it would take a long time to download each photo to your phone.
The images size/resolution which are sending wirelessly are preset and can't be set from user end. It's just the limitation of the wireless network transit speed. The increase of the image size may cause the image to take more time to be sent. It also consumes more power and increases the possibility of sending failure.
HCO Outdoor Productshttp://www.hcooutdoors.com/
3120 Medlock Bridge Rd.
Norcross GA 30071