Welcome to Springfield Heights

I'm not sure if this has been asked already, the thread is so long, I didn't read all pages.
I can't go on, because there is only 20 storage for smartphones, and I need 25 to upgrade the building with the flats. It says I shall extend the storage, but it doesn't say how. I get new characters only if I extend the building, so what to do???? :?: :cry: