my phone 5s facetime icon missing my country bangladesh i want facetime appa active plz help

Settings app > FaceTime > turn it ON.

Where did you buy the iPhone, and did it ever have the FaceTime app?

On the home screen, swipe down from the top so you get the search field and keyboard. Type Face Time to see if the app resides on your iPhone. If it does not, your iPhone is from a country that prohibits FaceTime and the app can never be added.

If the device originated from Saudi Arabia or the United Arab Emirates, it’ll never have FaceTime.

If the device originated from a different Middle Eastern country, FaceTime may only be available for it in that country.

If neither of the above applies, check the device’s restrictions.

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Wireless carrier support and features for iPhone in the Middle East - Apple Support - https://support.apple.com/en-us/HT204042 -

"FaceTime may be unavailable if your device originates from this region and becomes unlocked or is used in another country."

Wireless carrier support and features for iPhone in Africa - Apple Support - https://support.apple.com/en-us/HT204045 -

"FaceTime might be unavailable if your device originates from Egypt and becomes unlocked or is used in another country."