How we can make a phone by raspberry pi and gsm and TFT touch screen of 5inch display with rtandroid applying

Friends send u R idea to build it.make way part of it to make it

Hi @srikanth.pinnaboina5, welcome to the Cayenne commmunity!

What exactly are you trying to build here? Your own phone with a Raspberry Pi operating the guts of it?

I’ve often thought about getting an old Western Electric 2400 phone, -and putting a Pi inside w/a battery. Run “MagicApp”, and have a VOiP phone. I’ve seen several very innovative circuits to generate the 108VAC “ring” voltage. Gawd, I love those antique telephones! Low Tech Rotary Phone Made Wireless. : 21 Steps (with Pictures) - Instructables