Which reliable home internet: 5G router plan or fiber, and are there hidden data limits?

What is the best low cost prepaid plan under 25 with 1GB to 2GB, and can I port my number?

Can I get a reliable alternative plan if my signal drops indoors and will it differ on the same towers?

My data feels stuck on 3G, how do I restore LTE or 5G without paying more?

What is the best month to month 5G home internet while waiting for NBN installation?