If you need to transfer a lot data from device to device how is the phone the best choice??? They have these crazy inexpensive things called Flash Drives! They are like super cheap, portable, fast, and much easier to use! You can put one in your hat! You can keep it on your belt! On your keychain, shoelace, drawstring, pocket, backpack, wallet, purse, socks, underwear for god sake! You could swallow it if you wanted to! They are so small you could tape it to your leg and forget about it for weeks! (unless you bathe which I always suggest).
These things are more portable than a phone, less money than a phone, way WAY faster than a phone, and universally work with any computer you can find. Why is the phone a better choice?