4G enabled iPad mini + Panic's Prompt.app for iOS. It wasn't a regular thing, just resolving some access issues (on servers) for colleagues (at an all remote agency).

Having said that, I've also used a Thai 4G sim to tether (and allow colleagues to tether) for data while in Melbourne and while in California.

If you don't mind sharing the details, what was your job on a beach in Thailand? ;)