First- and second-generation Kindle and Kindle DX devices had no Wi-Fi support, relying solely on free 3G connectivity to reach Amazon—which is a real problem for those devices, since US mobile network operators will begin reclaiming 2G and 3G frequency bands for use with 4G and 5G this year.

First-gen Kindle owners can get a free 10th-gen Kindle Oasis and cover, and second-gen Kindle and Kindle DX owners are eligible for $70 off a new Kindle Paperwhite or Kindle Oasis, plus $25 in e-book credits—but you'll need to use a promo code from the email Amazon sent in order to qualify.

Without the promo code, Amazon only offers first-generation Kindle owners a $5.00 Amazon gift card.

Although only first- and second-generation Kindles lose all connectivity when 3G sunsets, devices up to and including 8th-generation Kindle Oasis (released in May 2016) will be restricted to Wi-Fi connectivity only.

Kindle Keyboard (third-gen) users get the same offer that Kindle DX users do, while 3G devices from the fourth through eighth generation are eligible for $50 off a Paperwhite or Oasis, plus $15 in e-book credits.