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A multi-carrier GSM phone with two, three or four SIM cards. Dual-SIM phones are popular with global travelers who use local and foreign carriers as well as people who want a business and personal line in one device. Triple SIM and quad SIM phones support three and four carriers respectively. Following is the alphabet soup. See SIM card.

DSSS (Dual SIM Single Standby)
Older dual SIM phones had one transceiver and only one carrier would be active.

DSDS (Dual SIM Dual Standby)
Also called "DSS" (Dual SIM Standby). Two receivers/one transmitter. Accepts calls from one carrier at a time.

DSDA (Dual SIM Dual Active)
Two transceivers enable calls with two carriers simultaneously.

TSTS (Triple SIM Triple Standby)
Three receivers/one transmitter. Accepts calls from one carrier at a time.

QSQS (Quad SIM Quad Standby)
Four receivers/one transmitter accept calls from one carrier at a time.
References in periodicals archive ?
Narayanan doesn't find it convenient to carry eight phones around and this is why he believes smartphones should start having a triple SIM card slot.
This has become possible through the use of Giesecke & Devrient's (G&D) triple SIM card and market-leading subscription management software solution which enables mobile operators to now stock a single SIM card instead of the many different SIM cards they have to at present.
The triple SIM integrates all SIM form factors for various devices on just one card, while the subscription management solution takes care of picking up the right profile on the SIM chip.
He ruled out any phablet by Acer in near future, but indicated that the company will continue dual SIM card options in smartphones and may introduce triple SIM card option in future phones.
Snapdragon 410 chipsets integrate 4G LTE and 3G cellular connectivity for all major modes and frequency bands across the globe and include support for Dual and Triple SIM.
LG Electronics, which continues to expand its footprint across Saudi Arabia with a host of academies for women and sought-after premium brand products, and also incorporates green technology in its premium products, is set to launch a new Optimus Series & Triple Sim mobile phones, according to James Park, regional MEA chief executive officer of LG Electronics based in Dubai.
It will unveil the first gaming QWERTY phone and a triple SIM offering GSM/ GSM / CDMA.
But there is also a larger than earlier estimated double and triple SIM holders.
One in ten mobile phones sold in the region are now dual SIM on average, according to GfK, a market research company, and triple SIM card devices are being launched.
Featuring an extremely long battery life, triple SIM (1) capability and Zero Air Gap screen, the Liquid E700 is the perfect companion for users needing a device that provides uninterrupted connectivity, entertainment and communication on-the-go.
Spreadtrum Communications Unveils SC6600L7 Triple SIM Solution II-31
The product supports different multi-SIM options, including dual SIM, triple SIM, and Quad-SIM in a single set of baseband and RF chip, provides more choices to handset designers and meets need of users from different regions.