Irrelevant, the phases are just a way of identifying which announcement batch a cabinet was in, but phases do overlap and you can have cabinets from a 2013 phase still waiting to go live.
i.e. being in a phase does not convey any guarantee of delivery by a certain date, or even guarantee delivery as cabinets do drop out e.g. power company increases quote, locals object to cabinet location, wayleave negotiations block work to get fibre to cabinet