Samsung SPH-a640 Series User Manual page 36

Portable tri-mode telephone
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Wireless TTY calls to 911 may be corrupted when received by public
safety answering points (PSAPs) rendering some communications
unintelligible. The problem encountered appears related to TTY
equipment or software used by PSAPs. This matter has been brought to
the attention of the FCC, and the wireless industry and PSAP community
are currently working to resolve this.
29 Phone Basics

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