Bear in mind that the sim can hold 10 messages, the phone can hold tons more (depending on the amount wallpapers, photos, ringtones, games,themes etc you have )
As for transfering photos to the PC, you'll need a bluetooth dongle. They can be picked up from eBay for about �15, if not less.
You plug it into a spare USB port, turn bluetooth on on the T610. Search for bluetooth devices, right click the T610 icon when it appears and choose pair device, choose a pass then enter it on the phone. Then you can transfer photos aswell as ringtones, games, themes etc. no need to spend money on a ringtone ever again =)