How do you set the time on a GE 29196GE1-A wall phone

It is a very basic mechanical timer. I have 3 of them.

Remove it from the wall.
Pull the tabs up for Off and Push tabs down for On.
Set the Time by turning the dial, time to arrow.
Set the slide switch to Timer On.
Plug in the appliance.
Plug the timer into the wall socket.

Manual and Advertising is here.

GE 15119 Manual - Waterheatertimer.org

http://waterheatertimer.org > pdf > GE15119-Man...

PDF GE 15119 timer manual http://waterheatertimer.org/How-to-set-timers.html http://waterheatertimer.org/GE-timers-and-manuals.html#52012.

GE 15119 Indoor 24-Hour One-Outlet Plug-in Basic Timer ...

https://www.toolboxsupply.com > products > ge-15119...

GE Indoor 24-Hour Mechanical Timer is an easy-to-use basic timer. Ideal for lamps, seasonal lights and portable fans. Turns a lamp on/off at desired times daily, ...

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https://www.searspartsdirect.com/model/4tnhwmc3jr-000432/ge-jtp25sh6ss-electric-wall-oven-parts?page=3

Might try calling Sears for assistance:

https://www.searspartsdirect.com/model/4tnhwmc3jr-000432/ge-jtp25sh6ss-electric-wall-oven-parts?page=3

set the clock to a new time:
TIMER/CLOCK Pad
To set the clock, touch this pad twice and hold 3
seconds and then touch the + and - pads. The
time of day will flash in the display when the
oven is first turned on

Yes the lamp must be turned on.
Bulb must be in working order.
http://waterheatertimer.org/GE-timers-and-manuals.html#15004
If link above does not show your timer, then add a comment

The GE 15004 timer does not have a manual at Jasco, so many folks write in about this timer

To set the timer, rotate dial until current time lines up with pointer located on inner dial.
The trippers are located on outer edge of dial.
I'm am guessing that you move the trippers around to time, and then push tripper inward or outward.
I have looked at enlarged photos of timer but cannot say exactly how the tripper is set.
Green tripper is ON
Red tripper is OFF

There is a switch located on side of timer.
Move switch to ON for timer to operate.
Plug lamp into timer.
Plug timer into wall.

To check on-off settings, manually rotate dial clockwise with your hand and watch lights turn ON-OFF.
Check switch is supposed to be set ON, by moving switch both ways.

You can also take advantage of fixya phone service.
Expert will talk with you via phone for a price.

GE 15086 manual:
http://waterheatertimer.org/pdf/GE-15086-Manual.pdf

That isn't a whole lot to work with. Get a working phone and take the cord out of the base of the GE and plug it into the working phone.
If the working phone gets a dial tone, look into the modular receptical on the GE base and see if the contact wires aren't out of place.
If you don't get a dial tone on the working phone, try changing the connection cord between the phone and the wall. Also look for the same problem in the wall receptical as discribed above for the GE base.

just before you press the button to set time, press "0"

I have a GE 6.0 cordless & it did work great but, Now for what ever reason it crackels & the static is so bad i can not understand those who call me . I love this phone so please help me. ?

I would like to reset the time, also. I cannot locate a users manual. The one I received with my phone is written in Spanish.

after reading fine print, that is how they are suppose to work. Only one works at time.