As of 2014, there are six mobile operators that offer mobile connectivity for tourists. Grameenphone and Banglalink are the largest. A passport is required to purchase a SIM card.
Top Prepaid SIM options
1. Grameenphone Cost: 150 BDT ($2 USD) for the SIM, 20 BDT ($.26 USD) for 25 mb data lasting 10 days, or 300 BDT ($4 USD) for 2 gb data lasting one month. Link
2. Banglalink Cost: 188 BDT ($2.30 USD) for the SIM, 200 BDT ($2.60 USD) for 350 mb data lasting 10 days, or 750 BDT ($9.50 USD) for 3 gb data lasting one month. Link
Where to Buy: Authorized outlet.
Call for Information: +880-2-9513328
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