fonmigo is an innovative service in the UK for renting a Smartphone or Mobile Wi-Fi device. Perfect for people travelling to the UK who don’t want to incur large roaming charges on their existing phone. It’s a pre-paid service with no contract to sign, and the phone can be delivered to your destination before you arrive.

This service means that you will pay local rates for your calls in the UK, and you have unlimited internet and Skype calls in the UK with all Smartphone rentals. fonmigo estimate that they can save you 80% on your international roaming and data charges.

MO-Call gives cheap call rates from mobiles, fixed lines and computers as well as cheap worldwide SMS. The service is available worldwide (apart from the Home Service), and, they offer 24 hour support.

Once you’ve registered you get a small amount of credit to try out the service before having to add credit. The MO-Call website give a comprehensive list of all calling rates which you can view in GB Pounds, Euros, US dollars and Aus dollars.

Vox Call is a prepaid international calling service you can use with any phone to make international phone calls. Vox Call customers can save up to 95% on their call costs versus direct dialing from their cell phone and traditional international long distance plans. There are no hidden fees, no contracts, and it works automatically with your current carrier. Calling plans are currently available for usage within the Domestic US, Alsaka, Hawaii and Canada (additional 15 cents per minute when used from Alaska and Hawaii / Additional 5 cents a minute from Canada).

Using Vox Call is easy: Dial a local access number, or use the toll-free access number that is provided: (800) 706 – 5915. When prompted, dial the phone number for the person you want to call. (Remember not to hit “send” if you are calling via a mobile phone). Your call will then be connected automatically by Vox Call.

telfree’s new app for mobile phones gives you cheap mobile phone calls by bypassing your mobile service provider. There is a set rate for all calls to mobiles anywhere in the world and another set rate for landlines worldwide. SMS rates are also very cheap worldwide and that’s all in with the free package.

Subscribe to the Professional or Ultimate package and you get even cheaper calls, push technology to be able to accept calls even when the app is switched off, and an incoming number (if there is one available in your country). What’s more, you can try it for free for 30 days without any contractual obligations.

Line2 is a second phone line for your iPhone. It’s an app that works over 3G, WiFi or Cellular networks to give you cheaper calls. The extra line comes with unlimited voip calls to the US and Canada, cheap international call rates and up to 20 person conference calls. Also works on Blackberry but with fewer features.

Line2 is offered on a 30 days free trial, so you have nothing to lose. After that the full service costs $14.95 per month.

Friendcaller is a browser based system for making voip calls, which means there is no software to download, simply call directly from your browser page. The system is a Java applet which works on all platforms and you can call all countries. There is also a software download called FriendCaller 3 Pro for the iPhone and iPod Touch.

The fact that you can use FriendCaller from your browser means that you can use it anywhere on any computer so long as you have internet access, and you can call mobiles and landlines.