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Out of curiosity - How does dual SIM work? Does the phone register with both networks, or does it switch allow you to quickly switch over before making an outgo
by xur17 12y ago
Out of curiosity - How does dual SIM work? Does the phone register with both networks, or does it switch allow you to quickly switch over before making an outgoing call?
- noselasd 12y agoYou're registered to one of them at a time. Baseband chips typically only handle 1 network at a time. Here's an example http://www.youtube.com/watch?v=nw76tsRKa_Q#t=44 http://www.youtube.com/watch?v=nw76tsRKa_Q#t=44
- userbinator 12y agoIt depends on the type of dual SIM exactly; it could mean anything from not more than being able to switch between two SIMs, to being able to use both of them simultaneously. The Mediatek dual SIM phones do register to both networks at a time, they have two IMEIs as well. http://www.youtube.com/watch?v=Ro7k4itFT-U http://www.youtube.com/watch?v=Ro7k4itFT-U
- Ecio78 12y agoafaik there are two different ways of operating: DSDS (Dual Sim Dual Standby) e DSFA (Dual Sim Full Active). The most common is the first one, where the phones are both registered but when you're communicating with one sim the second one is unreachable (as there's only one radio circuit, one antenna, one processor etc..). The second one, as the name says, allow you to use them both but it's more expensive of course because of the presence of two circuits of everything (at least radio-wise, it's like having two different phones in one) so it's far less common. As far as I know almost all the "chinese" dualsim phones fall in the first category.