Thread: Possible End of N900 era on t-mobile US
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juiceme is offline juiceme
2020-08-06 , 10:32
Community Council | Posts: 4,920 | Thanked: 12,867 times | Joined on May 2012 @ Southerrn Finland
#29
Originally Posted by pichlo View Post
How would you explain that? The phone needs 3G at least for the registration, but then uses 2G for making calls? Or are the calls somehow routed through 3G after all?
Easy to explain, also 3G (which actually is called WCDMA UMTS but some people prefer 3G, maybe they think it is shorter thing to to say...?) provides wireless packet connectivity of many types just like GSM, plus a handful of oter new protocols.

So when you make a CS voice call with your 3G-only network, it handles the packet flow over the WCDMA air interface. Also you have the advantage of having simultaneous PS access which people notice for example when surfing with the phone while having a voice call.
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Last edited by juiceme; 2020-08-06 at 10:40. Reason: fixed quoting
 

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