None of the iPhone 6plus support dual SIM dual standby. The national version of iPhone?6?Plus (A1524) is all-network, i.e. it supports 2G/3G/4G (GSM, WCDMA, CDMA2000, TD-SCDMA, FDD-LTE, TD-LTE) of China Mobile, China Unicom and China Telecom.

The national version A1593 is a customized version for China Mobile, which only supports China Mobile 4G (GSM, TD-SCDMA, TD-LTE), and can activate FDD-LTE while roaming.

The iPhone 6 Plus is a smartphone launched by Apple Inc. in the United States on September 10, 2014, Beijing time. Using a 5.5-inch screen, it was launched on October 17, 2014 in mainland China.

According to a survey conducted by market research firm CIRP (Consumer Intelligence Research Partners) in the United States region on the sales of the iPhone 6 and iPhone 6 Plus after 30 days on the market, the results were that the iPhone 6?s share of shipments in the entire iPhone lineup reached 68 percent of the entire iPhone lineup, and about 23 percent for the iPhone 6 Plus.

That means the two new phones accounted for 91 percent of the iPhone lineup within 30 days of launch, with the iPhone 5s and iPhone 5c accounting for the rest of the lineup. according to CIRP, the iPhone 6 and iPhone 6 Plus are outselling the iPhone 5s and iPhone 5c by a ratio of roughly 3 to 1, which is very similar to the iPhone 5s vs. The iPhone 6 to iPhone 6 Plus ratio is about 3 to 1, which is similar to the iPhone 5s to iPhone 5c ratio in terms of numbers alone.

Reference: