AASTRA DT4x2 for BusinessPhone User Guide EN - Manual (Page 114)

Installation
BusinessPhone – Cordless DT412/DT422/DT432 114
Belt clip
The clip on the back of the Cordless helps you fasten it to a belt or
similar. It is also possible to change the clip to a swivel-type or if no
clip is needed, to replace it with a covering plate.
Change the hinge-type clip
A hinge-type belt clip is mounted on the Cordless at delivery. The
clip can be replaced with a cover plate that is in the delivery or a
swivel-type belt clip that can be ordered separately.
The required tool is a Pozidriv Point size 1.
Unscrew and replace the clip.
SIM card
All your personal Cordless settings are programmed and stored in
the Subscriber Identity Module (SIM) card.
The SIM card provides you with personal mobility as you can easily
move it to another Cordless phone, enabling you to receive calls,
make calls and keep all your personal settings such as phone
book, identity, alert signal, and your defined functions of the Soft
keys and Hot keys
Changing the SIM card
Remove the battery as described.
See section “ Battery ” on page 111.
Slide the SIM card out of position.
Insert the new SIM card and slide it into position.