They are a lot better and advanced. Cell phones back then may not of had cameras on them. There was no internet, gps, may not of played music, smaller, bigger screen, touch screen, no siri like the iphone, or texting with letters on a keyboard.
They have become more portable and smaller some bigger. They have gotten sleek and very smart (thus the smartphone) they advanced what a phone can do from Just calling to today we can use the Internet, play games, surf the Internet, instant message, social media etc. all from our phones! Hope this helped a little. Got any questions? Just ask me in the comment :P