Thesis: Cell phones have changed over the past 37 years in the areas of usage and popularity, appearance and features, and the cost of cellphones and their services.
P2: I. The usage of cell phones today vs. when they were first invented
- Who uses cell phones now and then
 - Common uses for cell phones now and then
 - Popularity of cell phones now and then
 - Cell phones in other countries now and then
 
- Weight
 - Size
 - Display screens
 - Flip/Slide/one piece phones
 - Color
 - Features of cell phones now and then
 - Battery life now and then
 
- Popular service providers now and then
 - Cost now and then
 - How easy they are to obtain now and then
 
I like your outline; you've got the whole thing figured out
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