SIDS Baby Monitors range of Telephone Baby Monitors, which can allow the parent to call through to the monitor, effectively turning your mobile into an audio baby monitor.  The process can also be reversed, allowing the baby monitor to call any number given to it. These Baby Monitors are available for use with landline, mobile or even using Bluetooth technology. SID Says "This is the baby monitor for parents with a busy social life - monitor your baby through your mobile phone and check on the babysitter to see if they are having a party in your absense"