I own 2 Sony M4 Aqua mobile phones. Both of them have internal memory of 8 GB, out of which more than 4 GB are occupied by OS, Android. As a result, I cannot even update the apps that Sony installed on this phone, as it hasn't the necessary space. The phone becomes, therefore, unusable. One solution would be to increase the internal memory to 16 GB.

SONY, please help us!