Please take a look at the section on All Things Root for the Ally. You'll find info there about rooting your phone, which will then allow you to do such things as install a custom ROM, remove the bloatware your cellphone provider loaded on there, and install a version of apps2sd which will then let you move your apps to your SDCard. I currently have about 30 apps installed that way while still having about 78 MB free memory for the phone.
Good luck!