I have a BT Synergy phone with caller display but the c/display dosent work in my lounge only in the spare bedroom. If I plug in my old phone the caller display works in both. I have changed filters but its still the same. On the instruction leaflet it says don't place it to near other electrical appliances like PC or TV, which I have for convenience like near to my monitor. Any ideas please would be appreciated.

SOURCE: set time and date on bt synergy 3505

to set the time the instructions are on page 9 of the instruction manual in the getting started section.

in case you no longer have the manual....

1. press the tick/menu button twice.
2. press 0 and you hear 'to set the day and time press Star, to hear the day and time press Square.
3. press star. you hear 'please enter new day and time after the tone' enter the day (1=sun, 2=mon etc) enter the time using 24hr clock.
4. press the X/security button twice to exit.

hope this helps.

SOURCE: we have a bt synergy 4500

It sounds like you're pressing the green button when you pick up the phone - when the phone is in the charger and you pick it up to answer it you'll be speaking straight away, no need to press any buttons.
You can toggle between speaker and the phone by pressing the green button.

Hope this helps...

SOURCE: BT PHONE MODEL SYNERGY 3100 DIGITAL CLARITY

http://bt.custhelp.com/cgi-bin/bt.cfg/php/enduser/cci/bt_adp.php?p_sid=KEyO-6Fj&cat_lvl1=1243&cat_lvl2=1899&cat_lvl3=1897&cat_lvl4=1918&p_cv=4.1918&p_cats=1243,1899,1897,1918&p_faqid=11935

this is the manual for synergy 3100

SOURCE: how do I set the time and day on a BT synergy 3505

http://www.scribd.com/doc/3541578/BT-Synergy-3505-Manual-USer-Guide

if you follow the link thats your manual