Series 60

Series 60, later renamed to S60, is a Symbian user interface used on most of Nokia's smartphones. It was also licensed to other manufacturers: Samsung, Sony Ericsson, LG, Panasonic, Lenovo, Sendo, and Siemens.

1st Edition
The first version of Series 60 was launched with the Nokia 7650, and was later used on the 3650, N-Gage, Siemens SX1 and Sendo X. Only 176 × 208 and 176 × 220 resolutions were supported. It is based on Symbian OS 6.1.

2nd Edition
The second edition first came with the Nokia 6600 in 2003. The Symbian OS base was upgraded to 7.0, and later up to 8.1a. It also added support for themes, which were installed using SIS packages like other apps, not NTH files like on Series 40.

Feature Pack 3
Feature Pack 3, sometimes referred to as S60 version 2.8, added support for 352 × 416 displays, used on the N90. FP3 also ran on the N70 and N72, but with a standard 176 × 208 screen. It uses Symbian 8.1a.

3rd Edition
S60v3 was based on Symbian 9.1, which means apps must be signed before installing. This restriction could be removed by jailbreaking the phone by using an antivirus exploit and ROMPatcher.

Even if jailbroken, it is not possible to run older S60v1 and v2 apps on v3 due to kernel differences.

Most S60v3 devices had a 240 × 320 or 320 × 240 screen resolution.

Feature Pack 1
Feature Pack 1 runs on top of Symbian 9.2.

Feature Pack 2
Feature Pack 2 upgrades the Symbian OS to 9.3. It brought a new multitasking menu and significant battery life improvements. Probably the easiest way to identify FP2 is by the three softkey labels, as opposed to two on previous versions.

5th Edition
S60v5, also known as Symbian^1, was the last version of S60 before it was succeeded by Symbian^2 and Symbian^3. It is based on Symbian 9.4 and designed for 360 × 640 touchscreen devices. As S60v5 was only for touchscreen devices, newer keypad Symbian phones still ran S60v3.

Nokia phones running 5th Edition were known for having issues, with Sony Ericsson and Samsung's devices having a much higher reputation.