In the past, iPads have not had SIM card slots because they did not need them. However, with the release of the iPad Air and iPad mini 4, Apple has added SIM card slots to their tablets.
This means that now iPads can work with cellular networks, which is a great addition for people who use the tablet for work or travel.
However, some people are still worried about whether or not iPads have SIM card slots because there is no way to know for sure. Apple could decide to remove the SIM card slot at any time, so it is important to be aware of this before purchasing an iPad.
In the end, it is up to each individual to decide if they want an iPad with a SIM card slot or not.