I know Google fi has been around for quite a while, but I recently switched and have been enjoying it a lot. My favorite perk has been when I travel internationally, you get high speed data rolled in to 200+ countries. Assuming you pick one of their plans that allow for that functionality. If you want a free $20 credit, you can sign up with promo code 8JRXF9 or this link will also take you there: https://g.co/fi/r/8JRXF9
It also kicks me over a $20 credit, so win-win!