The basic Ookla Speedtest.net will log over 1Gb of data used if you are on a 5G phone in a 5Guc tower. I have used up to 4Gb in just a few minutes running a few consecutive tests at my gym, which gets speeds of 500-700Mbps down. I keep a free unlimited line in the data position to preserve my $10 a month Kickback on my main voice line. I have 4 esims in my phone currently with 2 always active. iPhone 14 Pro Max with Xfinity/Verizon, FlexiroamX/AT&T, and 2 of my 12 lines for T-Mobile as daily drivers.