A:Answer No, you cannot add cellular to an iPad with only WiFi after purchase. iPads with cellular capabilities have a dedicated chip and antenna that are not present in WiFi-only models. This means that you cannot simply add a cellular SIM card to a WiFi-only iPad and expect it to work. If you need cellular connectivity, you will need to purchase a WiFi + Cellular iPad model. These models are more expensive than WiFi-only models, but they offer the convenience of being able to connect to the internet even when you are not in range of a Wi-Fi network.