Mobile reception highlands?

Hi,
I'm planning on fishing the highlands later this month. Likely areas are Little Pine/Fergus, Nineteen Lagoons area, Julian Lake.
Compared to the South Island of NZ the terrain is relatively flat, is there any reception in the areas above based on members experience?
I will have a PLB and have an Iridium sat phone which I can pre-pay if mobile is very patchy.
Thanks in advance,
MB
I'm planning on fishing the highlands later this month. Likely areas are Little Pine/Fergus, Nineteen Lagoons area, Julian Lake.
Compared to the South Island of NZ the terrain is relatively flat, is there any reception in the areas above based on members experience?
I will have a PLB and have an Iridium sat phone which I can pre-pay if mobile is very patchy.
Thanks in advance,
MB