Thanks for that Davy,it good to hear from some one who is already away and using 3.
A mi_fi sim and a phone sim are what we intend to use when travelling,from October on.
One thing, and it may not happen to you,but when we last used the phone sim,they turned us off after
2 months use in new Zealand.
We still have not contacted "3" to find out why,so will be curious to see if they allow your use to continue after 2 months.
Thanks again enjoy your trip