AT&T Next Questions.

I, too, am a Next phone buyer but am totally confused WHEN the Next cost will appear on my bill. On December 6th I "bought" a Next LG G3 (fantastic phone, BTW) and theoretically upgraded the line from a dumbphone to a smartphone (that is, the cost SHOULD have gone from $20 to $25 with the Next smartphone discount). Right up front my credit card was billed directly for the sales tax as expected.

The upcoming bill (due early January) does NOT reflect the purchase in any way - the multi-line plan still reflects the same set of dumbphones (no smartphone on one of the lines being acknowledged); no Next pricing at all is included. Indeed, the upcoming bill is the same as the last N month's worth.

Did I just hit the EXACT timing to delay paying the extra $30-ish/month that I was expecting til early =February= or did something go wrong internal to ATT during this transaction?

[I understand this may be a little too specific for a community question however it's possible others have run into billing strangeness similar to this]

you may have hit your billing cut off date.  so it would show up on the next bill.  I had that happen with one next phone we got the wife.