T42G dialing too soon, not interdigit timeout.

[Bobcat19]

So we have a T42G which is starting to dial from the 6th digit on after about 1 second, and of course it's saying the call cannot be completed or some similar error message.

The interdigit timeout is set at 4 seconds but it's happening way before 4 seconds is up.
It seems to only be happening on mobile phone numbers, which always start in 02.
There there another setting somewhere causing this?

My dial plans are as follows if this helps. (For New Zealand)

0[3,4,6,7,9]xxxxxxx - Calls within New Zealand.

[0800,0508]xxxxxx - Calls to toll free numbers.

02[0,1,2,3,4,5,6,7,8,9]xxxxxx - 9 digit mobile calls.

02[0,1,2,3,4,5,6,7,8,9]xxxxxxx - 10 digit mobile calls.

02[0,1,2,3,4,5,6,7,8,9]xxxxxxxx - 11 digit mobile calls.

2x, for calling extensions.