The ageing system first launched in December 2010 with the full name Android 2.3 Gingerbread and was designed to make the user experience faster and more efficient.
In some models this process may be different. In that case, go to device settings, system, scroll to advanced, then system update.
Unfortunately for some, their smartphones will not be able to make the jump from Android 2.3 to 3.0 and beyond. These include:
Sony Xperia Advance, Lenovo K800, Sony Xperia Go, Vodafone Smart II, Samsung Galaxy S2, Sony Xperia P, LG Spectrum, Sony Xperia S, LG Prada 3.0, HTC Velocity, HTC Evo 4G, Motorola Fire, and Motorola XT532.
If you can't upgrade, you can still access your Gmail account or even YouTube by logging into your Google Account through the internet browser on your phone.
Android 2.3 has been removed due to safety concerns, with older versions of software more likely to be infiltrated successfully by hackers.