With the amount of time we spend on our smartphones and tablets these days, it’s more important than ever to be mindful of how much we call and text – or the bills could add up. A number of apps can help by letting users make free calls and send texts, as PC Mike Wendland reports. Free Tone calls and texts any number in the U.S. or Canada for free. Plus, you get a free private number. Free Tone even makes free video calls. Sign-up is easy with email, Facebook or Google account, and you can use it across multiple devices. The app is free for iOS and Android with…