What happens when you put a DST SIM card into a b-mobiled branded TechFaith Flying Angel 46 USB 3G modem as shown below?
You get a bunch of fail as the modem is locked. This is a reason to buy a 3rd party 3G USB modem as it should support any SIM card and thus will be useful for bringing overseas as well. I contacted b-mobile who told me to contact the manufacturer. I tried to email but did not get any response from them. Perhaps it’s round 2 for trying to contact them or try to learn the inner workings for locking and unlocking modems.
The Wheat Field 
Good thing about Singapore is that the govt does not allow our telcos to lock down the device. My USB dongle which I got free from my telco can be use with any telco SIM card, including oversea. Just need to key in the APN :)
Yeah man, give props to Singapore government that prevents locking of devices. I think locking of a device is fine as long as they provide a good deal and an easy way to unlock (for a reasonable fee). Or have it like in France where after a period of time (I believe 1 year) they have to unlock the device for free.
Great info! Helped allot!