could someone tell me the costs of downloads when using 1-2call onto my mobile phone ?

per mb

and what are the connection speeds like ....

or maybe Orange are a better bet

maybe i may need to change my sim card

If your phone has gprs you'll get billed 1 Baht/minute by one2call

If you have strong reception signal you'll probably be able to download between 5 and 8 Mb of data per hour. Slightly more during very quit hours.

Not exactly cheap when you pay 60 Baht per hour!

If you need it over a longer timespan you're better of subscribing. I pay 350 Baht for 120 hours per month....

what do they charge for a MMS ? i can never find 1-2 calls website via google , what is their address ?

http://www.one-2-call.com/One2Call/index.jsp

Good luck to find something on that site, you're going to have to read Thai as there hardly is any English on it...