Apple Series 4 from Sprint on other carriers?
I purchased an Apple Series 4 watch through Sprint and used it with my Sprint phone and Sprint plan. I recently bought the series 5 through Sprint and now want to sell the Series 4. Will the Series 4 only work on Sprint network with a Sprint Phone? Or can it be put on Att or Verizon and paired up with an ATT or Verizon phone and plan? If so, will moving it to another carrier make it lose any functionality? Thanks.
Apple Watch Series 4, watchOS 6