The Blackberry cell phone has rocketed in popularity in Indonesia in the past few months, from fairly obscure to a “must have.”
The 4 reasons are: new, affordable data plans, Yahoo Messenger and FaceBook support, and a camera.
GSM/Edge data plans have been available for years in Indonesia, though somewhat expensive per KB, flaky and with an odd signup process (find out the right sms address and send a couple requests to it and wait.)
Now cell providers are promoting all-you-can-eat data plans at 5000 Rp/day (50 cents per day).
Wifi is popular for when they are low on cash but near a free wifi hotspot, available in most offices, hotels and malls.
Indonesia is a huge cell phone market, about the same population as the USA. Less than 1% of households have Internet access, although many employees now have it at work.
The only thing holding back Blackberry penetration is purchase price. Phones are not subsidized with long-term contracts as in the West, so they’re retail priced at $350-$600 each.
All of my friends there have asked me how much a Blackberry is in the USA. It’s priceless to see their expression when I say, “free with a service contract.” 
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It’s free in the US but you have to pay Blackberry monthly fee of USD 25. If the plan is 2 years, that’s a total of USD 600.