Trouble with multi-pairing bluetooth
 

I'm have bluetooth Bluetrek G2. This device working with two phones together - "multi-pairing mode" (in documentation). But i d'nt can correctly configure it. I wrote to support Bluetrek, and they answer me: "Phone must support multi-pairing mode". Who know, what phone models support multi-pairing mode. And how correctly configure their.
I'm have two phone Siemens S55. With they not work in multi-pairing mode.
May be who faced with this trouble and can help me.