Uniden Cordless Phone "tcx905 tru9466" Questions

...TCX905 Cordless phone Handsets # 3 and 4 will not register with my TRU9466 base. The manual recommends ''Resetting'' the handsets by holding down the [end call] and [#] keys for more than 5 seconds ...

...TRU9466 is a TWO LINE phone system. The handsets included w/ the TRU9465-2 look like the TCX905, but they're not. Remove the BATTERY COVER and BATTERY, then look at the inside label. The model # wil ...