How to save money with VOIP
VOIP (Voice-Over-IP) usage is spreading a lot thanks to various data package subscriptions for smartphones and tablets that mobile providers are offering.
By using a 3G/4G or HDSPA connection or, if available, a WiFi connection you can make free or chepa calls within some apps.
The VOIP usage is particularly suitable in various situations: for example long business calls, if you are outside your country and you want call your local numbers.
There are many apps and for various mobile OS, most popular are Skype, Viber and Fring.
All the 3 allows to make free and unlimited calls to other devices that use same app, Skype and Fring allows also text and with their SkypeOut and FringOut services to call or send messages to the devices that doesn’t use these apps at a cheap price.
There are many other VOIP services to make calls and some of them could be more cheapest than Skype and Fring, i found 2 useful services: Cheapest-Voip and this comparison table. These allows to find the better VOIP solution for each countr and both for landline and mobile calls.
About messages, Whatsapp is very popular, it allows realtime messaging by sending text, images, videos and audio to other mobile devices that use same app.
To send sms with a cheap cost you can use Freesmee, JaxtrSMS or Skebby buying sms subscription packages.
To monitor data usage there are various free apps for various mobile OS.
iOS: Onavo, QuotaLite, DataMan Free and the Cydia tweak DataMonitor that you can download from BigBoss repository (naturally for Jailbroken devices)
Android: 3G Watchdog, Onavo
Blackberry: Network Traffic Control
Still no apps for WP7.