all dual sim

... For example, a Tri-Mode phone is both Dual Mode and Dual Band, meaning it will ... is “ think everything is for speed.” Dual Band (dual mode) A feature on some ... or the 1900 MHz PCS frequencies. Dual-Tone Multifrequency (DTMF) The keypad ... and other advanced calling services. All wireless phones use DTMF dialing. Also ... facsimile service, data service, dual tone multifrequency service, SMS, MMS ... of a mobile phone. Read more about SIM Lock H HDML (Handheld Device Markup