Originally Posted by
jsnydcsa
1) I'd love to hear how to do that with a Mac.
2) Doesn't really solve the problem entirely as it requires me to lug around the laptop rather than having the mifi or mifi type device only.
3) Not really $0 as the T-Mobile USB modem is SIM locked so I need to buy another SIM-unlocked USB modem for use with everyone else's SIMs.
Sorry, I was only responding to OP question not yours.
In your case, you are pretty much stuck as you already know Tmobile use 1700/2100 BandIV frequency for their 3G/4G network which no one use.
You probably better off buying a seperate 3g usb dongle/mifi for intl travel and use a cradlepoint device to work with your Tmobile dongle.
Like you, I travel to Asia every other month and currently I use the Sprint overdrive in US and an unlock AT&T usb modem when travel abroad. Works pretty well.
BTW, here is the link on sharing WIFI signal on leopard.
http://gigaom.com/apple/create-a-wif...on-in-leopard/