or being struck by vehicles or hammers, many times of which the phone proved its record. The 3310's reputation for durability led HMD Global to develop the Nokia 800 Tough with MIL-STD-810G standard compliance in mind. Features The Nokia 3310's main new feature introduced over its predecessors was a Chat function. This is an instant messaging-like feature that works on standard SMS. The 3310 was popular for SMS text messaging because of Chat and also because it allowed long messages three times the size of a standard SMS text message, at 459 characters. It also featured threaded SMS writing and voice dialing for the quick dialing of selected numbers. The 3310 is known for having many features that were rare for the time. These include many utilities, such as a calculator, Nokia network monitor, stop watch and a reminder function. It has four games: Pairs II, Space Impact, Bantumi, and the hugely popular Snake II. The Snake series of games had been popular on Nokia handsets since the late 1990s. CNET remembered Space Impact, a shoot 'em up in which the player fires projectiles at oncoming aliens, as a mediocre game overall but impressive for fitting a mobile device with its complexity and length. It was later recreated for other mobile devices. The Nokia 3310 runs on Nokia's proprietary Series 20 software. The Nokia 3310 uses a MiniSIM (more commonly known as a standard SIM). Customization The Nokia 3310 can be customized with interchangeable Xpress-On covers, and thousands of different designs have been produced by various companies. It also has over 35 ringtones built-in with space for seven custom tones. These can either be downloaded, or composed by the user on the handset. The phone has various "profiles" that can set a number of preferences such as silent mode where the phone will not ring, useful for situations where it is inappropriate to do so. Screensavers can be made from received picture messages. Variants 3315, 3390 and 3395 An enhanced version of the 3310 is the Nokia 3315, which has some additional features: A picture editor to edit pictures for use in SMS Picture messaging and screensavers on the phone Timed profiles Could use received ringtones as SMS tones Fixed some of the bugs found in the 3310 Automatic keypad locking after specified time The right button, which finish the call, activates the key guard at the same time. So