New answers tagged hand-luggage
I had a small amount of beach sand from a Florida beach and it was confiscated by TSA agents at the Tampa airport. The sand came from a relatives beachfront home and they said it was ok for me to have it.
Air China seems to have a policy in place for the batteries (or generally termed power banks) 10000mAh should amount to 36WH or 50Wh depending on whether the batteries are rated 3.6V or 5V. However still, policy says that 2 batteries are allowed that shouldn't exceed 160Wh. EDIT: As identified by @DCTLib below, only two spare batteries are allowed in cabin ...
Given your description, it sounds like that the phones will remain in Australia with the children. If that's the case you will need to declare the phones and pay duty on them as the combination of the two will be above $900 in value, and you will also need to pay duty on any other goods you plan on leaving in Australia as once you're above the limit duty ...
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