This phone is problematic because it has such a small memory, which wouldn’t be a problem if you could just move everything over to an SD card. The phone won’t let you for anything that runs on Google or for Facebook or Facebook messenger which are both fairly large in size. You can have those on there and have enough to run, but you will constantly get notice that you are low on memory.
Low memory makes updating apps difficult and the phone has a weird flaw when it updates the apps you moved over to the SD Card. When they update, sometimes they revert back to being on the phone memory and not the SD card, so it really eats your memory. Updating apps also takes a lot of memory for the download process so when you have to update some of your larger apps, it will say there isn’t enough memory and then you have to go searching around for ways to free up memory, like finding out which apps got moved back to internal memory, clearing out the cache, deleting apps, etc.
When the apps update, the icons will also disappear from your wall.