The phone was developed during this time. It can be seen that in the past, the phone will be large and expensive. Until there is a small and not very expensive, plus portable.
The phone, developed tremendously over the past this. It can be seen that the phone in the past, a large and expensive to a smaller and more affordable and also portable.
The phone is developed greatly in the past. To see how the phone in the past, large and expensive, and is small and very inexpensive and portable convenience.