Google Fi is currently offering Simply Unlimited Plans at $20/month per line for 4 to 6 lines. They are also offering the Pixel 7a for FREE after 24 months of bill credits ($499 total) for new customers, with a limit of one free phone per line. Effectively, you can either buy the phone at MSRP and get two years of unlimited 5G service for free (minus taxes/fees), or pay $20/month for the service and get the phone for free. 0% financing is available for those that would rather not pay for the phones upfront and instead have the full monthly service charge.
Simply Unlimited comes with unlimited calls, texts, and 5G data ( 35 GB/month per line, then falls back) within the US, Mexico, and Canada. 5GB/month of hotspot tethering included per line. Google FI runs on the TMO network and reportedly shares the same top prioritization mode as native unlimited contract TMO customers.
https://fi.google.com/about/phones/pixel-7a
https://fi.google.com/about/plans/simply-unlimited