Anything that isn't a weapon, can't cause damage, and is logical to take with you. If you want to take a cell phone you can, but put your cell phone into airplane mode before take off.
... only that which is absolute necessary on the flight. Rules vary between airlines, ask your airline or check their webpage.
Yes, it is allowed to bring condoms in your carry-on luggage on an airplane.
2 suitcases are allowed in an airplane
Passengers are allowed to bring containers of liquid that are 3.4 ounces or less on an airplane in their carry-on luggage.
Yes
No, such things are not allowed.
Yes this is allowed.
yes
no
Yes, aerosol cans are allowed to be checked in on an airplane as long as they meet the airline's regulations for size and contents.
It blocks out cellular information on your phone so you may legally use it on an airplane (You are not allowed to call on an airplane.)
Yes, you can use a Kindle on an airplane as long as it is in airplane mode and electronic devices are allowed during the flight.
NO! Absolutely not! If it's not allowed in the plane why would it be allowed in the bathroom?