Talk:European Union/@comment-174.118.100.109-20180203213352/@comment-24682153-20180206033854

Well, you can save on plane tickets as well as on roaming fees. The problem is your initiary. Only 2 of the 9 destinations belong to the EU. You can cover Portugal, HK, Macau, Singapore, Australia and the UK with a "Feel at home" PAYG SIM from Three UK (shown here: Euro3 ) Max. 9 GB of roaming for domestic UK prices. This SIM is sold via eBay.co.uk, but doesn't support 4G roaming or tethering. In Thailand and Malaysia you can get a SIM with data very cheap at the airport.

When you buy an international SIM you will pay at least €20 per GB (see all countries). This can be a good deal as long as you only need not much more volume. But for uses beyond you should check out the national chapters of this wiki for domestic offers as an alternative.