To my knowledge, you have PROVIDER lock and NOT country lock on phones.
If the phone is asking for the sim, and if it is the default sim, read through the phone manual and there usually is one, something like 0000, that you can try.
Also, make sure that the SIM you are using uses the same band that the phone can use..I am unfamiliar with GSM bands in Bangladesh.
Finally, there usually are some shops, I know there are in India, that can unlock the phone for you, if it is something that you cannot figure out yourself.
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