I bought the i-smartphone 2008 from brando's website for $20.50 + $3.00 shipping & it took like 11 Days for me to get it, but it worked except for edge............... I google arround and found nothing. So I played around with with the settings and I discovered a fix.
First make sure the sim adapter is installed properly. Once you have done that disable the 3G and let the phone recognize the sim card with the adapter installed as soon as you see the carrier name appear go to settings/general/reset and
rest the network setting. You will now see the Edge symbol.
That's All You Have To Do!
I Have T-Mobile USA (internet2.voicestream.com)
Make sure you check your APN settings
Note: I noticed that after reseting the network settings the sim adapter turned off the 3G automatically, forced selected T-Mobile as my carrier and turned on data roaming.