Who invented the dual SIM dual standby phone?

Ericsson, not Sony Ericsson, which has already been acquired.

You're just talking nonsense. The dual-SIM dual-standby mobile phone was invented by Jiang Xiuhong.

It was not invented by him, in 2001 in Shenzhen.

There are many telecom and mobile dual SIM (telecom 3G Internet access, CDMA200), there are also Unicom and mobile dual SIM (China Unicom 3G Internet, WCDMA), and there are also mobile dual SIM (3G network a TD-SCDMA, 2G network one).

Dear, the Android system has:

Coolpad N930

Hello! Benefits of Dual SIM Dual Standby Phones:

1. If you have two cards, you don't need to bring two mobile phones, which is trouble-free;

2. Sometimes in order to contract the machine, the new number is added, and the new card can be used as a network card, the original card is used to play, send and receive text messages, for example, mobile 3G is too slow, you can use a mobile card to play **, telecommunications, Unicom card 3G card for Internet access, the network speed is very fast, this is the best combination.

Dual-SIM dual-standby phones are a little more expensive than single-SIM phones, because the cost is a little higher. If you like the new model is dual-SIM dual-standby, it doesn't matter, just insert a card, it's OK, and it won't affect the quality of the call. I often use it this way.

When choosing a mobile phone, you must choose it in combination with the mobile phone card (mobile, telecom, Unicom) card you use, otherwise, you may not support your mobile phone card, or you can't access the 3G network.

Mobile card: You must choose to support TD-SCDMA network mode to access the mobile 3G network (fast network speed);

China Unicom card: You must choose the one that supports WCDMA network mode to access the China Unicom 3G network (fast network speed);

Telecom card: to choose the support CDMA2000 network mode, in order to access the telecom 3G network (fast network speed).

It means that one mobile phone can be compatible with two cards at the same time. The benefit is that two cards are on standby at the same time. Calls can be answered regardless of that number. The disadvantage is that it is more complicated to make mistakes, and you need to select the network every time you dial up.

I feel that the dual-SIM dual-standby phone is ugly. And it doesn't work well. Especially the domestic ones, as for why, as the people upstairs said, the more powerful the function, the more people buy!

No Not all domestic mobile phones are dual-SIM dual-standby. And the single card is still the most.

Existence is reasonable, and the market is explanation.

Hehe, dual SIM dual standby is powerful. The people who buy it will probably be more, haha.

Is it to be smart? For example, Lenovo has several dual-SIM dual-standby smartphones, and it is not expensive.