1, personally feel that it is still worth maintenance, did not fall into the water is generally not bad.
2, Apple mobile phone plus this model is large, so easy to break, especially your touch ic, if you want to continue to use, go to the store or find acquaintances to repair, do not intend to use then change the phone, repair touch ic is not wrong if the store is 800 bar, like, the general repair shop will be very cheap.
I have encountered this situation, I am also a mobile phone repair engineer, iPhone 6 touch failure screen jump phenomenon, most of the screen problems, iPhone 6 Plus this problem is generally on the motherboard touch ic problem, which is the factory design left defects, i6 is recommended to change the screen first