Tech question: Portable Wi-Fi Hotspot

[Duaine]

I’m looking for a Portable, secure, Wi-Fi Hotspot to use with my P.C. when processing apps in out-of-office locations.

My cell carrier is AT&T but would like to be able to jump on any Wi-Fi signal. Also need an affordable rate plan for data usage.

Any ideas or personal use ideas or tips?

Tks.