Superfans and holdouts using some older smartphone operating systems will have to bid adieu to WhatsApp messenger soon—or at least the most updated versions of the app. According to an FAQ page, the Facebook-owned messaging app won't support Blackberry OS, Blackberry 10, or Windows Phone 8.0 and older after December 31, 2017. That means that on the first day of 2018, users will no longer be able to create new accounts or re-verify existing accounts on those operating systems.

WhatsApp will still work on those systems, but it's unclear how long the app will be fully functional. The FAQ page does warn users that some WhatsApp features may stop working on these unsupported platforms because the company is no longer actively developing for those OSes.

To avoid issues, WhatsApp recommends users of those platforms either update to a newer OS version or use WhatsApp on a device running Android 4.0 or newer, Windows Phone 8.1 or newer, or an iPhone running iOS 7 or newer.

WhatsApp also announced that it will support Nokia S40 for only another year (until December 31, 2018) and devices running Android 2.3.7 and older until February 1, 2020. The company claims these platforms, in addition to Blackberry and older Windows Phones, don't have the "capabilities" it needs to support future app features.

Blackberry users already got more time with WhatsApp than previously anticipated. The messenger extended its support for Blackberry earlier this year to the end of 2017, but it appears the messenger isn't going to put energy into the platform anymore. While the app still works on newer Windows Phones, those users still have to reckon with the fact that Microsoft isn't too interested in updating its mobile platform.