Dual SIM phone is a mobile phone with two SIM cards which can operate at once, so that instead of two devices (eg home and work, or domestic and foreign) with a device would suffice.
There are two types of mobile Dual SIM depending on their simultaneity:
- One SIM Dual Stand-by or not simultaneous, which means that one of the two cards is inactive. To use the inactive card must first disable the other.
- SIM Dual Stand-by or simultaneously, allowed to have two phone lines running simultaneously, with different signal coverage and can receive calls on both numbers.
Evolution of the Dual SIM technology
Initially, the dual SIM technology was implemented by applying a dual SIM adapter in a normal cell phone. However, these phones have only one transmitting-receiving establishment; there was no real simultaneous use of two SIM cards.
Depending on the capabilities of the device must either be on for one of the two SIM cards are chosen, or were both SIM cards at a certain pace alternately. Devices then really as dual SIM device was designed, possessed two transmit / receive devices. The first generation of devices that consumed so much of the battery capacity, resulting in a limited talk / standby time.
As a temporary solution to this problem, therefore, these devices are supplied with two batteries. By the progression of technology in the devices could be made more efficient so these devices again a normal talk / standby time received.
Popularity of Dual SIM Cards
The Dual SIM phones are especially in Asia popular. This is mainly due to the way in which mobile services operate. Example, it may be advantageous to using provider ‘A’ on the phone and via provider ‘B’ and SMS. With a Dual SIM phone can then both functions are carried out with a phone.
There are therefore several Asian manufacturers of mobile phones that has Dual SIM models in their assortment.