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A typical relay service conversation. A telecommunications relay service, also known as TRS, relay service, or IP-relay, or Web-based relay service, is an operator service that allows people who are deaf, hard of hearing, deafblind, or have a speech disorder to place calls to standard telephone users via a keyboard or assistive device.
Many digital cell phones are compatible with TTY devices. [11] [12] Many people want to replace TTY with real-time text over IP (RTT), which can be used on a digital cell phone or tablet without a separate TTY device. [13]
EV-DO is not designed for voice, and requires a fallback to 1xRTT when a voice call is placed or received. Notes: All speeds are theoretical maximums and will vary by a number of factors, including the use of external antennas, distance from the tower and the ground speed (e.g. communications on a train may be poorer than when standing still).
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CDMA2000 is a family of 3G mobile technology standards for sending voice, data, and signaling data between mobile phones and cell sites. It is a backwards-compatible successor to second-generation cdmaOne (IS-95) set of standards and used especially in North America and South Korea, China, Japan, Australia and New Zealand.
The current cheapest cell phone plans are Tello 1GB, Mint Mobile 4GB and T-Mobile 3GB, but also double check what new deals are coming out as well as if the carrier has changed any details within ...