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Could you tell us what provider you're using for these phone numbers? Many services won't sent SMS to VOIP numbers due to fraud, fake accounts, etc.

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These are Twilio numbers. I have had success with verification using Twilio numbers although sometimes the "Call me instead" option is required. I implemented a simple voicemail inbox for those cases.

Your mileage may vary of course. I'd like to collect a list of services that don't allow verification at all via landline/VoIP and post it.

I’ve tried using Twilio in the past to automate 2FA for a shared team account and the number just got rejected everywhere I tried. This would be great if it works but given that defeating this isn’t one of the selling points on the main page I’d guess that it’s not something that has been considered.

Success with 2FA depends on the type of phone number. Right now oneway.tel offers US wireline VoIP numbers (from Twilio), which won't work for verification with some services (although there's no technical reason they can't).

I have one customer using a UK mobile number (also from Twilio) to successfully authenticate with Wise (among other things). If you're interested in testing out a non-US mobile number let me know via email to hello@oneway.tel and we can work something out.

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