Can I change the cellular data on my iPad?

If you are asking can you add cellular data to a wifi only iPad,

the answer is no.

If you are asking can you change from cellular data provider A

to cellular provider B, the answer is yes. There is a caveat that

if the iPad was acquired as part of a special package with your

current provider, your iPad may be locked to that provider so you

would have to work with them to see if they offer unlocking

and if you qualify.

If this is not what you are asking, provide more details so someone

may offer a solution.