[OFF-TOPIC] 2g and 4g

Question

i need java code how i can change betwoon 2g and 4g in android phone

Answer 1

Go to your settings and change it.
Why do you need a code for that.
BTW , you need deep android understanding to do so.

Answer 2

i need make a programme withe tow options: 2g or 4g. for 2 reasons: have some informations. and i sweetch many times between 2 and 4 G. and use the seting take some time and processes.