To quantify the comments regarding congestion though for those following , Tedzart is on the edge of two sectors, one congested (with upgrades planned to resolve this) and one that is still in the acceptable range.
On my personal end, I'll be down in fielding over Christmas, May look to travel down to Foxton for a visit of the area.
From a much earlier post on ADSL I "think" l know roughly where tezart is. Is the congested sector the one pointing to the beach? What would the upgrade entail? A Spark outlet told me it would need another cell site. That interests me more from the point of phone coverage. It's a lot easier to compensate for coverage with a fixed modem.
Yes, that is the sector which is congested.
Thing to remember is the Modem isn't doing CA AFAIK.
where as mobile devices are, which would hide the "disconnect" (the tower's L700 and L1800 are slightly off angle)