Beacons: Android / Iphone Bluetooth range

we try to develop a ios and andorid app with beacons. it only uses the entry and exit event.

now our problem is that the android gets the enter event at ~7meter and the iphone ~1.5meter.

the beacon settings are TX Power -23dbm, Measured Power -80.

is there a way to adjust the android or iphone to get the same range?