What is heating problem of techno canon i after sometime

My tecno mobile not reching the network ........ plz help me

Display isnot support for anything.....I want to change my display folder....mobile is techno air spark 2 and model no LC8.....1month older mobile.

mor mobailtur ata problem hoise chargot logai vedio sale charg noloy..plzz help korok.kiba hol problem..aji 1mah hol lobo.

My display broken but working and i have a warranty that freely I can repair the display in techno mobile. So please tell me the proper service center address nad timing in how much time it take to repair my mobile .
Also tell me the cost since my display of mobile in warranty.so tell me the repair ing cost. Since it's free.