Just wanting to add my experience here as well... I recently travelled to both Seattle and San Fransisco where the service was a joke. Like many, I was completely unaware of the issues surrounding roaming and so found it unusual when I was thrown on to the T-Mobile network. Rarely when out and about in either city, would I have ANY signal at all, just "no service". Occasionally I would get a 4G signal, but it would very quickly drop to Edge, or no service and I would then run through the whole airplane mode toggle cycle to get the signal back.
The whole experience made my trip a complete nightmare, I almost missed a ferry as I wasn't able to download my tickets, and rideshare apps were completely unusable unless I had a WiFi connection somewhere.
For reference, I was using an iPhone 13 Pro and was paying the £6 daily fee to use data abroad, and honestly I feel robbed as I was rarely able to actually use said data. I even reset my network connections on my phone in the hope it was some weird glitch, but that didn't help.
To summarise, I wasn't even able to get a reliable 4G data connection in two of the most technologically forward cities in the world, using a less than 12-month-old device, let alone make any kind of calls. It was a complete joke, and frankly dangerous... Next time I am in the US, I will be buying a US carrier data e-sim for the duration of the stay.
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