There are lines coming on the display

The rear camera of my HTC 830 mobile is vibrating continuously and a small sound is coming because of vibration. i cannot use rear camera. I bought this s mobile in Nov 2016.

Why this is happening and how I can clear this issue.

My HTC D828d Mobile Phone is randomly going power-off

Dear sir, i have purchased htc desire 816g mobile from dubai..unfortunately display has damaged and i need to change orginal display for proper working..i am from tamilnadu..my nearest customer center is trivandrum..its also farest distance from home..i need informatiom that how much amount it ll b take for repair,if i give repair,can i get mobile phone that day itself..i am expecting reply and good service from you ....

I need to replace my htc desire 620g battery, is it available at htc tvpm customer care office?

Model;htc m8 eye,
Display change how much of coast

Battery charge falls down fastly

Reboots automatically and i wont disply the home screen .and error is seen in home screen

Htc u ultra,complient is charging slowly,iam residing at trivandrum,pls give me nearest service centre,address and phone number

I checked in the site for htc trimmer service centre in Trivandrum City. Whatever number I got, not attending or not in use. Kindly provide me the working tel number of your service number in Trivandrum City Kerala. My no. is 7558812183