How s2 updates are pushed

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http://forums.androidcentral.com – I'm wondering on how and by which criteria android updates come available for the S2. For example, me and a colleague both have an S2. Phones are bought in the UK in the same store (I bought my phone about a half year after my colleague.) The phones are "non operator branded"; they run samsungs stock android and are simlock free or however you call this, they are just bought from a major IT supplier chain without any relation to an operator. We both have the same subscription type and operator at the moment. My colleague however got an OTA notification about a month ago for the Je (HowTos)