Can I use a Carcomm cradle for my mobile phone if it is a different model?

Each Carcomm cradle is designed for a specific mobile phone/smartphone model, so that it holds your device securely, the connectors are in the right place, and any required controls are usable. So you need to order the specific Carcomm cradle for your phone.

Does it matter which mobile network I am using (eg Telstra NextG, Optus, Vodafone/3)?

Carcomm cradles can be used with phones connected to any network. If you are using Telstra NextG and want to use an external antenna connected to the cradle, it may be worth checking whether your antenna is optimised for Telstra NextG. We sell two versions of glass-mount antenna that are Telstra NextG optimised: a
5db version and a 7db version.