How do I register the base on my phone. - Motorola Mobility L902C DECT 6.0 Headset/Cordless Phone Combo wi

Is the handset you are trying to register de-registered? if not it will not register to another base until it is.first de-registered.
To de-register the handset do the following-
With a charged battery in the handset Enter *331734# then without pause Press and Release the Menu Select Button. You will hear a Beep. Handset would then be De-registered..
Then place the handset on the Main Base cradle and follow the instruction that come up on the handset display.if the handset still does not register then most likely the base memory is full and will have to be re-set .
To re-reset the Base:- Remove any handset from the main base cradle. Then Press and Hold the Locator or find HS or handset Locator button until the IN USE light comes on and begin to flash then release it and immediately with out pause press and release it again. That will re-set the base memory. All your handset will then be de-registered and will to be re-registered. Place each handset to be re-registered on the Main Base cradle and follow the instructions on the the handset display and they will register.

With the phone in standby, press MENU/SELECT on the base.
Move the cursor to select the Register Handset menu, and then press MENU/SELECT. Handset Registering will appear.
On the handset, press and hold # until the handset beeps and displays Handset Registering.
When the handset has registered to the base, the LCD will display Registration Complete then show the handset ID number.
If the display shows Registration failed, repeat the process again.
Note: If a handset has ever been registered to a base, reset the handset before you register it to a new base

Would you try this procedure:-
-----------------
First on the base station..press and hold paging/register key for 3 seconds
Than on the hand unit select function key and open "MENU"
select "SETTING" from menu and confirm (Ok)
Selecect "HANDSET" and confirm
Than select" REGISTER" and confirm
than enter "0000" as pin and confirm..
it will flash and it detects the base.
-------------
Take care..

It is possible that you have maxed all of the headsets that can connect to the base. Yes, the base can support 10 headsets, but there is a small chance that in some way you registered more to the base or you purchased a base that had phone registered to it that are not in your possession. Either way, if the base is maxed out, you will not be able to register any additional headsets to it. The only option is to do a factory reset of the base unit if this happens to be the case. This is done as follows according to Uniden Tech Support:

1. Disconnect the power from the base

2. hold down the following three (3) keys: [dnd] + [middle soft key] + [*]

3. While holding down the keys, plug in the base (hold the keys down until you hear a long beep). This is supposedly all it takes to reset the phone.

The way to determine the number of hand sets tied to the phone is to press the intercom key on the base and scroll through the list of phones. if you see more than the number you anticipate still being tied to the base, you will have to utilize the above procedure.

I had a similar problem which I finally fixed. You did not say if any of your phones registered.
First try the following recommended by Uniden Support:
Your phone(s) should be fully charged before putting them on the main base.
Unplug the battery from the phone by removing the battery cover and removing the connector. Then, push the # and * key together and hold while you plug the battery back in (requires some dexterity). Continue to hold the two keys until you hear a confirmation tone. This will force the phone to reregister. Put the phone on the main base (if you are sure it has a fully charged battery) and see if it will reregister it to solve the problem.
That did not work for me. So, I followed the instructions to de-register the handset (even though it hadn't really registered). But, I also pretended like the Base was not available (because using the base in this step also failed).
1) Press and hold the hang up and # keys for at least 5 seconds.
2) Move the cursor to select Base Unavailable and then press Select.
3) Select the base you want to deregister from, press Select and then move the cursor to Yes and select.
This causes the phone to delete any of its base information.
At this point, again insure that your phone shows the battery is fully charged and if it is not, put it on the stand alone charger base (not the main base). With the battery fully charged, place it on the base and try registering again by placing it in the main base.
If neither of these approaches help, contact support at Uniden.com.
However, my problems were cleared when I cleared the handset with the second set of instructions.

I solved it out u must pres de paging button on the base while registering the phone to base keep the paging button pressed until starts to beep like 5-10 sec. Good Luck

I think this may be the answer. With multiple handsets reading "Please register" and a "working" base station (w ith dial tone). If you bring the remote units to the base station and place them on hte base, they will register and stay registered after you return them to the remote base. It doesn't say this anywhere in the instructions as it gives you the impression the remotes will register from their own base.

Registering Handsets to the Base
Whichever handset you choose to charge in the base is automatically
registered to the base. Any additional handsets must also be registered to
the base before you can use them.
Be sure both handsets are fully charged.
One at a time, place each handset in the base. The charge/in use LED on
the base begins to flash, indicating the base is registering the handset.
Wait for at least five seconds, then pick up the handset and press
[talk/flash]. If the display shows TALK, the handset is registered. If not,
place the handset in the base to try again.
Press [end] and continue with the next handset.
Note:
Once both handsets are registered, it doesn’t matter which
handset is placed in the base or the charger.
When you charge the handsets, Caller
ID summary screen and the name of
the handset appears.

This can be find from uniden website.
http://www.uniden.com/pdf/DXAI4588-2om.pdf

push menu on base station - select register phone

push # sign on twx977 phone at the same time

phone will register on 9485 base station and unit