I have one broken touchscreen smartphone and one used normal button-operated phone that I don't use anymore. I also have another smartphone that I use.
I want to take them home from Poland to Bangladesh for possible repair and then give away to my relatives for free.
Will airport authority create problems?
Will airport authority create problems?
Similar to this question, airport authority couldn't care less. Customs might care, probably Bangladesh customs since that's where you're importing something. You can check the Bangladeshi customs exemptions rules here, I assume you can read it (the English part only covers tourists, you've mentioned Bangladesh is home). Generally, if you're not importing commercial quantities, I'd expect broken phones to be within exemptions limits, but confirm that.
Another aspect is security - at the departure airport the security personnel may want to confirm these are in fact phones. If they don't turn on and the security personnel cannot verify that they are in fact phones, you might not be allowed to board with them. So if the screen is completely broken and shows nothing when you turn it on, that may be a problem from their perspective.
Bringing those old phones back shouldn't be a problem. I've seen it done plenty of times without issue. Just be sure to declare them honestly on your customs forms to avoid any confusion at the border. Be mindful of the phone batteries. Airlines have rules about transporting lithium batteries in luggage, both checked and carry-on. It's smart to look up your airline's policies beforehand.
