Yealink's own website claims to work with Yealink T42S phones, but requires a firmware update to at least version 66.84.0.10. Please ensure your phone can be updated to this firmware before purchasing - AT&T-ready devices will get stuck at 66.81.25.9 on 3/8/2021 and are therefore not compatible. AT&T advised us to buy the WF40 running the older firmware. I will try to update this review if not.
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