iDevices

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Where to buy apple iDevice in Bangladesh:
Apple Authorised Distributor:                                 Apple Premium Reseller:
Computer Source Machines Ltd                                              Executives Machines Ltd
Address: 419/B Alphana Plaza 51 New Elephant Road         House #183, Road #69, Gulshan Ave Gulshan 2
Dhaka                                                                                 Dhaka 1212
Telephone: (880) 2 9121484                                 Telephone: (880) 2 8800000
Website E-mail: muhib@computersourcebd.com                 Website E-mail: pinto@etlbd.net
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Apple Authorised Service Provider:
EL Trading Bangladesh Ltd 
Address: 34, Kemal Ataturk Avenue Awal Centre, (1st floor) West side, Banani C/A, Dhaka-1213
Bangladesh 
Telephone: (880) 2 8861271
Website E-mail: jtbl.tech@jelcorp.com
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If you are importing your iDevice (i.e; iPhone, iPad, iPod), you have to unlock the phone/device to use network in Bangladesh. Apple released new devices with newer iOS (iPhone Operating System) as well as you can update your iOS to latest version using iTunes in order to get maximum feature available in your iDevice. Thus in either case, user have to check if the device is jailbreakable and/or unlockable.
Here is some link to check if your iDevice is unlockable/jailbreakable at the moment:
To see what version of the iPhone OS (operating system) you are running, go to Settings >> General >> About