I have a ZTE Mustang / ZTE Z998 it has 4 GB of storage but 2GB of it is taken up on its own by the programs the phone needs to function. So the other 2GB are taken up pretty quickly, thus I need more storage. I know you can buy memory but I don't know if they are compatible with my phone? *besides telling me to go to the store and ask* Has anyone done this? Does anyone know if its possible to add more memory to this phone? Will any memory from the AT&T site ok?