Switch from AT & T to Sprint and selected the plan for our family of 4. Our 2 sons live in St Louis and we live in San Antonio. We made the switch for us immediately and received new phones. We were told at the store that our sons could switch over too. One son has a brand new iPhone X and one has an IPhone 8, they told us they couldn’t be unlocked by ATT until we paid off, so we did. Now they are both unlocked but now we are being told they will not work on Sprint.