I have an 8 on Verizon Device Payment. Their site says I can pay off half the device and trade it in and upgrade (I'm considering an 8 plus). The site also says "If your device is working properly, send it in after you upgrade and you're all set." So if I read that right, that means I could be in posession of two phones at once, which is key. My 8 won the Apple QC lottery and is perfect and I don't want to turn it in unless I'm sure the replacement also has perfect QC. But let's say the 8 plus has a bad screen, cosmetic defects, or I just plain don't like it after a few days and want to keep my 8. Can I just return it and keep the 8 and restore my upgrade eligibility as if I never tried a plus? Curious about upgrade experiences from those on this program.