How do I get a SIM card in Oman and which is cheapest for calling Bangladesh?

Oman's main operators are Omantel and Ooredoo. Buy a prepaid SIM at an operator shop with your passport, which is needed to register. A prepaid starter costs around OMR 2 with some credit and data. Important: normal WhatsApp and Skype voice calls to phones are blocked in Oman. To call Bangladesh legally and cheaply, use the Ooredoo Talk app, or buy an international minute bundle from your operator. That is a good reason to compare Omantel and Ooredoo before choosing. Once you have your Resident Card you can switch to a postpaid plan. Keep the SIM registered in your own name so you keep control of your number and can top up easily.