"Beta" served as the beginning of Android mobile operating system.

Since 2009, Android OS versions have been
developed under a codename and released
according to Alphabetical order:

Cupcake (1.5),

Donut (1.6),

Eclair (2.0–2.1),

Froyo (2.2–2.2.3),

Gingerbread (2.3–2.3.7),

Honeycomb (3.0–3.2.6),

Ice Cream Sandwich (4.0–4.0.4),

Jelly Bean (4.1–4.3)

and KitKat (4.4).

On 3 September 2013 Google
announced that 1 billion activated devices now use
the Android OS worldwide.

The most recent major Android update was Jelly Bean 4.3, which was released on commercial devices on 24 July 2013 .

On 3 September 2013, Google announced Jelly
Bean's successor as Android 4.4, KitKat, with a
release date yet to be announced.

But who knows if there might be a possibility of an Android OS called "Blackberry 4.5"