Smartphones or tablets can be compatible with the latest generation Elite trainers (with ANT + or Bluetooth Smart protocols) if they have connectivity with these protocols.
Depending on the operating system of your device, you can check for compatibility.
Two apps can be downloaded to check instantly if the device has these protocols
ANT + = https://play.google.com/store/apps/details?id=com.quantrity.anttester
Bluetooth Smart = https://play.google.com/store/apps/details?id=com.magicalboy.btd&hl=en
It is necessary to check on the manufacturer's site or follow this simple rule:
ANT + = no iOS device has ANT connectivity
Bluetooth Smart = iPad later than version 3 included and iPhone later then version 5 included