The clamps that grip the phone can also move to allow access to the USB jack for example! Too bad they are a bit too far from the base of support. Therefore my phone (Samsung S4) does not rely on the support: it holds only clamped by the clamps ...
Likewise the support is removable, it can be "disconnect" of the articulated arm. This is not really well done, and the support kept falling for me. So I preferred the solidarity with the arm by putting a dot of glue.