On 1/12/11 5:25 PM, Russell Coker wrote:
Apparently you need to either have a phone with two 3G antenna (which is really rare) or a phone that can do calls over GSM while 3G data transfer is in progress. Hardware to support voice over GSM and data over 3G is apparently reasonably common, but software support isn't so good.
The 3G standard used worldwide (UMTS) does support simultaneous voice and data. There could be a million different factors why it doesn't work at a particular time. I'm certain that I have taken calls while 'tethered' up to a laptop before.
- or even for the OS such as Android to have a list of the APNs for all the telcos in the region and the bigger ones in other regions? A file with about 20K of data could have all the APNs that you are ever likely to need and a lot more and that would not be noticed in the gigabytes of storage that modern phones have.
There already is a mechanism - /system/etc/apns-conf.xml . I believe this file is empty in the Android Open Source distribution. Pester your manufacturer if they do not include a full worldwide list. Many custom Android distributions do have them. On 1/12/11 10:54 AM, James Harper wrote:
Can the iPhone be used as a GSM modem or is that deemed too 'legacy' these days? I'm hoping there is a usb switch app I can run to enable the modem USB interface but I'm not optimistic.
Highly doubt you will be able to - on older smartphones the modem could be made available over USB but this has died out in favor of tethering. I doubt any current smartphones could, either. a) The USB client functionality is in the kernel, you would need to add the relevant bits there to bridge between USB and the modem b) Even then the modem may not have a traditional serial interface - on those that do, it is merely an emulation layer coded into the radio firmware, and the purpose James wants ('circuit switched data' as it is called), it probably won't implement that. - Mathew