iTelSPlus is a free Android app developed by REVE SYSTEMS LTD. that offers a comprehensive billing alternative to the iTelSwitchPlus billing. The app allows you to add reseller and PIN, recharge PIN, reseller, and client, and top up from PIN. It also provides features to monitor active calls, generate monitoring reports, view payment history, top-up history, and profit summary.

The app's user interface is straightforward and easy to navigate, making it accessible even to those with little technical knowledge. iTelSPlus is an excellent tool for businesses that need an efficient billing system that can handle multiple transactions. Moreover, the app is free, which makes it an attractive option for small businesses that cannot afford expensive billing software.

Overall, iTelSPlus is an excellent billing alternative that provides a comprehensive set of features to manage your billing transactions. If you are looking for a free and efficient billing solution for your business, iTelSPlus is worth considering.