On 16.02.2016, at 09:13, Dmitry Zaharov <[email protected]> wrote: > Hmm... does it mean, if I've got a smartphone with 2 SIMs (actually, I've > got one among my stuff) - Mozilla Stumbler will use data from both SIMs to > report more accurate location?
I think support for using two SIM cards at once isn't all that well tested in Mozilla Stumbler. The main problem here is that the Android APIs we use weren't written with dual SIM devices in mind. So each device manufacturer has decided to shoehorn the information from both SIMs into those APIs in different ways. Generally dual SIM support might work starting in Android 4.2. As for using a phone with two (or more) SIM cards: This is only useful if the two SIM cards are from two different network operators or they use different radio types (say one is GSM/2G only, the other 3G/4G). The logical cell ids we capture are dependent on the radio type and the network operator. If we have two actually different data points from the two SIM cards, then both will be used and might result in a better location. > The question in this case: should I prefer stumbling with dual-SIM phone > instead of my single-SIM one? As above, this is only useful if the two SIM cards are actually capturing different information. > And, if yes, - will this collected information (collected with the dual-SIM > phone) helps me to determine more precise location, using my single-SIM > device? Probably not. A single-SIM phone typically only sees the full cell id from a single cell network at a time. Only in LTE networks might we see complete information from multiple cell networks. With a single data point, we either have data about it or not. In constrast to WiFi networks, were all phones always see all networks, phones are only looking for networks from the operator the SIM card is from and then only for one cell network at a time. Hanno _______________________________________________ dev-geolocation mailing list [email protected] https://lists.mozilla.org/listinfo/dev-geolocation
