*I believe you need to be ROOTED before doing this.
1) I used Root explorer and went to:
2) put the folder in R/W mode (look at top for button)
3) now look for -
4) long hold press it, either copy it and paste it in another folder as backup.
5) go back to /system/app/ and long hold press sprintadroidextension.apk
again and Delete it.
6) put the folder back in R/O mode.
Now restart and you should not see anymore activation messages!!!!!!!!!!!!!!! =]
Thank you to [XDA]: foxmeister, sirmacbeth, rkmj