Dock

you can put your mobile phone on it and echo enhance the sound but it depends on your phone mine is
Xperia Z sorry for grammatical mistakes cuz i don't know English well it seems very coarse cuz i just wanted to make a model of that

you just need: carton, glue and scissors

first of all draw your plan then cut the carton as the plans

assemble the pieces

now you have a stand for your mobile phone