Thanks for sharing Evo. Very useful info for me.I use Software TTY on Apple 7 plus device without relay service. Just TTY to TTY anywhere as I use to TTY call to contact Bank of America for emergency if my debit/credit cards has been lost or stolen (Avoid relay service may steal my CC numbers as I would be scam victim) and I can TTY call to contract AAA tow truck service if my car break down while I am on vacation,
and I use a LED backlite bluetooth keyboard for travel and vacation or survive kit due to power outrage.
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Also, Telemarketers try to call my Apple smartphone. I switched TTY mode to relay service. Telemarketers are stuck with relay service as they hung up on them and they can't bother me without ringing on my smartphone. i feel peace of mind.