The Nextbit Robin is an Android phone that aims to assuage your storage fears. If its 32GB of flash memory fill up, it’ll start uploading your apps and photos to a 100GB cloud account, leaving behind “ghost” icons that can re-download them on demand. It’s a feature that’s since been replicated elsewhere, but it’s still a solid phone for $118.
Amazon’s compatibility chart says it works on AT&T and only partially on T-Mobile, but every review I saw said it works perfectly fine on T-Mobile, if that’s your carrier of choice.