how can i unlock my Iphone 4s from Icloud?

If you're the device's original owner, take the device and its original purchase receipt to a physical Apple Store.

If not, but you're able to contact the person who set the lock, send them this link and tell them to follow its instructions.

If neither of the above applies, you can't activate the device but may be able to get it refunded. Apple won't remove the lock for anyone other than the original owner(assuming they're alive.)

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i forget my apple id, i can't access to my account. i have my money receipt and everythings now what can i do? i am from Bangladesh and here is no apple store and my iphone 4s purchased from United Arab Amirate

This is Activation Lock, a theft deterrent. See: Find My iPhone Activation Lock - Apple Support

If you’re being prompted for a different Apple ID than the one you used to log into these boards, either use Apple’s iForgot service or click here and fill out the form.

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