We have two products in for review that offer a home or small-office version of the gateways many cheap-call vendors use to undercut the big telcos. The Mobigater, from a Bulgarian firm of the same name, and the IP Voicelink for IPDrum, both allow you to make and receive web calls on a mobile phone.

You insert SIM card from an operator of your choice, which gives the device is a phone number. You can call that number to make an international web call; conversely any web call to the number can be diverted to your mobile. If you are always ringing your mum in, say, Kuala Lumpa, you could have a gateway at either end of the line.

The Mobigator is restricted to Skpe calls but the IP Voicelink has a SIP option.

So can you make this cheaper than using one of the cut-price operators? Well some operators allow you to call one designated number for free, and all offer deals bundling hundreds of minutes for local calls, so you probably can.

We've been slow to review the Mobigater due to factors beyond our control but we will be looking at both devices in the next few days.