Series 30+ (abbreviated as S30+) is a software platform and application user interface used for Nokia-branded, then HMD-branded mobile devices since 2024.

[4] In 2017, HMD Global released Nokia 3310 3G[5] that runs the predecessor version of Series 30+ UI platform based on Mocor RTOS developed by Unisoc, called Smart Feature OS.

[6] This partnership marks the first time that Nokia Series 30+ devices are capable of accessing YouTube, Shorts, TikTok, Google Sign-in Services and real-time modern web applications.

Since 2019, many Nokia S30+ models released with the Chinese Mocor RTOS platform (with some S30+ devices bases on old MTK MAUI due to without 4G support): Since 2023, many S30+ devices released with IP52 water resistance, some models with IPS display, including: Several S30+ phones since 2023 also featured built-in UPI payments app for Indian users only.

[24] Since 04/2024, many Series 30+ devices released with USB-C charging, including: Note: This list does not including Nokia or HMD phones that run Smart Feature OS based on KaiOS.Maximum accepted video resolution is 854×480.