I have purchased iPhone 6 MG472J/A model from japan. I want to use it in Bangladesh. But, sim card of Bangladesh is supporting my iPhone. I have contacted with iPhone suggested Robi and Grameen Phone to unlock sim but have not found any solution.

amindu14 wrote:

How to unlock carrier lock where unlock service is not available?

You don't. IF the carrier doesn't offer unlocking then you can't get it unlock,

The Japanese carriers do not offer unlocking. That phone is useless outside of Japan. Return it and buy a phone you can use.

amindu14 wrote:

So, how can I unlock?

YOU CAN'T!

You were already told that. Stop asking and return the phone.

amindu14 wrote:

So, how can I unlock?

Please go read my response to you.

I already answered your question, so did Tim.