I have three handset cordless phone only the main base phone work the other two says connecting when you turn it on but it wont connect it have loss its connection with the base phone

There is a simple FIX here:
From the "Connecting...." handset, type *331734# then hit MENU button.
Boom..... handset should now read "NOT REGISTERED"
Now you're ready to follow the manual directions:

• Place handset on main base
• Hold "Handset Locator" button until red light solid
• Remove handset and then place back on base
• Handset should now be registered

You're done!

try removing the batteries from all of the hand sets.wait 30-60 seconds. 1 by 1 replace the batteries and place them on the main base. this will re-register the phones 1,2,3 etc. as you plug them into the base, they will be numbered sequentially

try connecting both phones via the base that is working and see if they recognize each other. Let me know if that works.

If the other three handsets work ok then you have a defective handset.

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Handset can not link.
• If any handsets become inoperable, place it on the main base cradle for 20 seconds to re-register.
No dial tone
• Check or repeat installation steps
• Make sure the base power cord is connected to a working electrical outlet.
• Make sure the telephone line cord is connected to the base unit and the modular phone jack?
• Disconnect the base from the wall phone jack and connect another phone to the same jack. If there is no dial tone on the second phone, the problem might be your wiring or local service.
• The handset might be out of range of the base. Move closer to the base.
• Make sure the battery is properly charged (for 16 hours).
• Ensure the battery pack is installed correctly.
• Did the handset beep when you pressed the TALK/CALL BACK button? Did the in use indicator come on? The battery may need to be charged.
http://www.home-electronics.net/ge/pc/IB/25922GE2_IB.pdf

Quickly, return this Phone is you still have a chance, my small business used this phone for EXACLY 2 years, and now all lines are DEAD, NOT A SINGLE ONE WORKING. LINE ONE AND THREE HAVE NO DIAL TONE EXCEPT EXTREMELY LOUD STATICS. AND LINE 2 AND 4 ARE TOTALLY MUTED.

A lot of my customers are complaining about not being able to reach me in my office.

From the manual:

VERY IMPORTANT: BOTH HANDSETS MUST BE REGISTERED TO THE
MAIN BASE BEFORE USE. After the 2nd handset has charged for 16
hours, place it on the main base station for 20 seconds, it will then
automatically register and verify its security code.

Unplug the battery. Hold down The * (star) and the #(hash) keys simultaneously. Re-connect the battery, phone will beep and screen will be blank. Press the voicemail (righthand silver key under the lcd screen). As above EEPROM/RAM message will appear. Place handset on base and your problem is solved.

Check that you have the larger power adaptor connected to the base unit.