Is resetting an iPhone the same as restoring it with iTunes?

So a few days ago i got a message on my iPhone that if i don't restore my iPhone then I won't be able to receive or send calls and I can't do that either. I looked on youtube on how to restore an iPhone and it said you needed iTunes but I don't have iTunes on my computer. So would restoring my iPhone with iTunes be the same as resetting it?

1 that doesn't make sense y would you have to restore and 2 its kinda the same it doesn't factory restore it just wipes data (i think)

Resetting your iPhone changes everything on your settings to default. Restoring erases everything on your phone.

It is the same!

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