I've been swindled. The 3G, HSDPA high-speed 7.2Mbps modem that I bought yesterday, in tandem with a sim card for Celcom, turns out to be a bit of lemon. I think the modem is probably alright, but Celcom's service leaves much to be desired.
It goes up, and down, with long periods of no data sending at all. Seriously, I've had bouts of food poisoning that were more reliable than this horrible Internet connection. When it does work, it's actually pretty snappy... but that is perhaps 5 minutes of every hour.
Hopefully, in Indonesia, with a different 3G provider, it'll be better. In the mean time, I'm back to using WiFi and Internet Cafes.