Calls to mobile phones are much more expensive than calls to landline phones. Although standard rates vary, one thing is for sure, you will always end up spending more on your mobile charges than you will for your landline charges. A SIM Gateway helps to lessen this cost by allowing you to connect SIM cards to your company’ PBX. What this does is allow you to use the actual mobile phone network when making calls via your company network. In effect therefore what you are actually doing is creating a network that allows you to call with mobile to mobile phone rates rather than landline to mobile rates.