Section 2A: Your Sprint PCS Phone - The Basics 15
A note about Memory:
The following features may share memory: contacts, text, graphics 
and ringers, calendar to-do notes, games, and applications. Use of 
one or more of these features may reduce the memory available for 
the remaining features that share memory. For example, saving many 
calendar notes may use all of the available memory. Your phone may 
display a message that the memory is full when you try to use a 
shared memory feature. In this case, delete some of the information 
or entries stored in the shared memory features before continuing. 
Some of the features, such as ring tones, graphics, and applications 
may have a certain amount of memory specially allotted to them in 
addition to the memory shared with other features.