Any time you upgrade and call in to Verizon to activate the phone, the rep has to manually apply the device swap. Sometimes, even if you paid full price, or are using an alternate upgrade from another line, you might get a rep who is new or just makes a mistake and counts the device swap as an upgrade. The key phrase in those device swaps is "customer provided equipment".
If the device is added as an upgrade, sometimes that not only removes the the unlimited data from being active, but also removes it from being available on the line. Which means the rep needs to send a request to re-add the feature, wait up to two weeks for that to be approved, and then follow up him/herself to manually reapply the feature.
Additionally, since using an alternate upgrade allows the line the phone is ultimately going to to retain it's unlimited data. Verizon has made it so that by some avenues (online and possibly in store), you cannot share an upgrade between two lines that *both* are eligible. So if you have an upgrade on your line with unlimited, you have to use that upgrade and lose it. Unless you call in and ask a rep to do it for you (or just activate the device on the proper line when you receive it by.... calling in).
If the device is added as an upgrade, sometimes that not only removes the the unlimited data from being active, but also removes it from being available on the line. Which means the rep needs to send a request to re-add the feature, wait up to two weeks for that to be approved, and then follow up him/herself to manually reapply the feature.
Additionally, since using an alternate upgrade allows the line the phone is ultimately going to to retain it's unlimited data. Verizon has made it so that by some avenues (online and possibly in store), you cannot share an upgrade between two lines that *both* are eligible. So if you have an upgrade on your line with unlimited, you have to use that upgrade and lose it. Unless you call in and ask a rep to do it for you (or just activate the device on the proper line when you receive it by.... calling in).