Low Cost SIM cards

I apologize right away for asking this question as I’m not an AOG user but there are lots of bright minds here and I need help. I’ve posted a few questions on here regarding my basestation and configurations and I have a working Mosiac X5 base and SNIP Caster operating on my farm. I have used most of the summer and all harvest and have had no problems when using multiple rover setups that connect through iPhone and iPad hotspots tethered to Ardusimple XBee Wifi devices, Trimble TMX 2050, and RTKonnect. I also have a CaseIH AFS Connect tractor using the factory NTRIP client with perfect success. It is on the Verizon network.

I also have two Ardusimple 4G Masters but I constantly drop the RTK fix when using them. They are not compatible with Verizon and are using a low cost Spectrum SIM card and a KIWISIM SIM card on the T-Mobile. Do these low cost providers have significant latency?

I’ll hopefully answer my own question here…I have been testing with the device sitting on the floor of my tractor or back corner of the combine cab. Today I was able to position it with the antennas close to the window and it worked great. I’ll look into a better antenna setup.

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