I've been doing some Googling for GSM shields and their prices and frankly I don't understand why they are so expensive on average.
The official one sold by Arduino is 71 euros for me (I live in Europe), and third party ones have similar prices.
A cheap dumb-phone is usually 30 euros and those phones have become really impressive these days, they have even a camera. When they are locked with the carrier the price can go as low as 20 euros. How is it even possible that a single part of what is supposed to make up a phone is more expensive than the phone itself? :(
Thanks in advance!