I'm on the T-mobile grandfather plan(not eligible for international roaming), and will be travelling abroad from Nov 8th to December 3rd to Cambodia, Thailand, Macao, Hong Kong, and China.

I would like international roaming whether its 2G or 3G.

Option 1. Buy $25 300MB/weekly pass(1-3 times), it would be 3G data
Use Family Allowance to set my text/minute limit to 0 to ensure I'm not getting any texts or calls, but while I'm roaming.. I don't know if that will work.

Option 2. Open a simple choice single line plan $50 plus taxes/fees and close at the end of the month

Option 3. Open a mobile data plan(for tablet only?) for $20 a month for 500mb, which allows unlimited international roaming.
Pop the sim card in my iPhone and use it abroad?

The 3rd option seems like the cheapest and least hassle way to get on internet abroad...

I'd appreciate any feedback especially using a tablet data plan on an iphone...