I've been asked about mobile phones (not my strong point) specifically about the memory they have.
One can purchase a phone with say 64GB of memory for a lot of money or one can buy a phone with little internal memory and a high performance (UHS II) 64GB card for about one third of the price.
The following link says that android 6 OP system will have a setting to 'extend' the internal memory to the SD card (I'm not talking about rooting the phone):
It also says that apps can only be installed to the SD card if the developers allow it.
I'm a little confused by all of this so I've got a few interlinked questions.
Is this option part of android 6 on all phones or do some makers disable this option?
Apart from the SD card now being linked to the phone is there any other downside to doing this?
Can I still have the situation of eg. 60GB free memory but an app won't install because there isn't enough (built in) memory available?