How to change SIM card PIN code, PUK code in a heartbeat

Tired of memorizing new PIN codes? We show you how to change your SIM card's various PIN and PUK codes in less than 5 seconds.

Although most people remember their primary SIM PIN code, those other codes - used for various verification purposes - are never to be found when needed. Below we've included a set of short codes which, when entered on a handset's standby screen, will let you easily change PIN and PUK (short for Pin Unlock Code) codes - but keep in mind, they may not work with all handsets and mobile operators.
More importantly, when changing ones PUK codes there'll be no help to get from the mobile operator if the new codes are forgotten, so make sure to write any changes down alongside the old PUK codes. Also, please note that the codes should be entered without the spaces shown below.
Change SIM Card PIN
** 04 * old PIN * new PIN * new PIN #
Change SIM Card PIN 2 (Write down the new code)
** 042 * old PIN * new PIN * new PIN #
Change SIM Card PUK (Write down the new code)
** 05 * old PUK * new PUK * new PUK #
Change SIM Card PUK 2 (Write down the new code)
** 052 * old PUK * new PUK * new PUK #
Display Handset IMEI
*# 06 #