NetAppel is a MobileVOIP app that allows users to make international calls at low rates or even for free through WiFi or 3G networks. The app is available for Android devices and can be downloaded for free. With NetAppel, users can select any contact from their regular contact list or add new contacts. If a user is already a NetAppel user, they can import their contacts from their NetAppel client.

To start saving immediately, users need to follow these three easy steps: download the app, register a username or log in with existing credentials, and buy some credits. NetAppel offers the first 90 days of calls to selected destinations for free after buying 10 euro credit. After these 90 days, users can use their bought credit for any calls to non-free destinations. NetAppel charges the lowest rates available, making it a cheaper option than most telecom providers.

It's important to note that using NetAppel as a default dialer may interfere with dialing emergency services. Overall, NetAppel is an excellent app for those who want to save money on their international calling charges.