The instructions are as simple as it gets, they don't touch anything about USB tty in the cellular area. The device works with AT&T in the US, but you have to literally look up the AP{N. Just use "BroadBband". As evidenced by AT&T's 6 hour tech support and various troubleshooting methods, they don't know how to set up anything other than a cell phone. Cannot be used with 3g and 4g although recording conforms to AT&T 3g and 4g specifications. The device looks well designed and well put together. good workmanship and form/function of the assembly. The software interface and manual make it difficult to set up. Changed from 2 stars to 5 stars for the dedication of the SerialLink support staff and the aggressive response of the tech support in trying to get this to work. Support emailed Q&A, today they logged in and tested remotely. It turned out to be a bad SIM card or a bad APN. After replacing the SIM card, I found that APN dat Only Devices is "Broadband" on AT&T. Surprisingly, none of the tech support knew about it. Very impressed with the support for the working product and in particular the serial connection support. Definitely a 5 star establishment.
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