There is low limit plans, just only on the sub-brands of the big 3. They all operate multiple MVNOs with a low-end tier like Lucky Mobile and Public Mobile, a mid-tier brand like Virgin (in Canada completely run by Bell Canada, only license name and logo), Fido and Koodo. These cheaper brands have cheaper plans like 5GB for $50 or 1GB for $25. But they are also artificially locked out on features. You can't have an Apple Watch on the low end brands, there's no visual voice-mail support, no RCS, etc. Phone choice is limited although that's less of an issue than it was.