[m_eiman]

Only two. I suspect next year's models will all have it.

http://www.usegalileo.eu/EN/inner.html#data=smartphone

[mnx]

If Snapdragon SoCs have support, could galileo support be enabled by a software update in phones that have them?

[m_eiman]

I don't think there'd be hardware reasons not to, but I'd be surprised if anyone did that instead of just selling it as a reason to upgrade to a new phone :P