I don't think its possible to configure the phone's second port as trunk port. You can configure a separate voice VLAN for the phone, but the phone's access port will be an access port.
Apart from that, even if it was possible, how do you want to achieve VLAN configuration on an unmanaged switch? You want to separate the VLANs 11 and 12, which indicates you need the VLAN information in the packet header. As the unmanaged switch is not VLAN-aware, it won't remove the VLAN information and send the tagged frames to the host and printer connected to the switch. And I'd guess thats not true for all unmanaged switches, some of them may just drop VLAN tagged packets.
All in all I'd strongly suggest to rethink your network design. To help you further this direction, we need more information about the circumstances. Why not connect the phone and printer directly to the managed switch?