The API seems well-documented, and the wireless SIM capabilities are great Review collected by and hosted on G2.com.
Telnyx does not have any meaningful support. My account was denied L2 verification, which is required to use the SMS API, and the only recourse given is to "contact support". I filled out the support contact me form, I called the support number on 4 different occasions, and I have yet to interact with an actual human. The support line rings and rings, until, after waiting on hold for 10-15 minutes, you are directed to a voicemail box where you can leave a message, which will not be returned. I have left three of them so far, with two different phone numbers to contact me at, and have never heard back, so, while I would like to use some of the APIs and features of Telnyx, I simply cannot since they will not verify my account and will not contact me regarding this. Review collected by and hosted on G2.com.
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Organic review. This review was written entirely without invitation or incentive from G2, a seller, or an affiliate.