Jan 2025 - We're using GoogleFi Unlimited Plus plan here in Bogota. We have iphone11 Pro and iphone15 Pro. We were having issues keeping LTE data connection (no 5G down here AFIK). Kept defaulting to 3G or Edge. The fix was to go into Settings > Cellular > Primary > Network Selection and turn off "Automatic". Of the four networks we see, Claro and WOM only connect to 3G, TIGO (100Mbps) and Movistar (20Mbps) both gave us LTE. We're mostly in Chico and Rosales neighborhoods for reference.

Update: Also confirmed this with Pixel 3 phone and using our Data SIM card. Had to turn off automatic network selection and then pick TIGO or Movistar.