The Internet data usage pertaining to data uploading may appear on the bill from your service provider, but it cannot be traced as activity from the TrackMyFone application.
TrackMyFone monitor the device, not the SIM card. So you will be able to continue monitoring the phone or tablet even after the SIM card has been replaced.
All post backup text messages, SMS and iCloud messages can be accessed with TrackMyFone even if they are deleted from the target device. Any data that is deleted prior to backup cannot be retrieved.
TrackMyFone runs will all iPhones and iPads with iOS 6 and over, and all Android devices with OS 2.3 and over. To check if your device is compatible with TrackMyFone, check out http://www.trackmyfone.com/compatibility.html.