Switches to 1x for phone calls and texts?

chrisnosleep · #1 (**permalink**) 10-29-2009, 10:09 AM

Is it normal for the Touch Pro 2 to switch to 1x during phone calls and texts, and then back to EvDO for everything else? I have a good EvDO signal but without fail, it switches every time. Shouldn't this stay in EvDO in order to make digital calls? Please forgive me for my knowledge of this is very limited. I'm concerned that if its not supposed to do this, it could be using more power than it should.

Thanks in advance!

**chronster** · #2 (**permalink**) 10-29-2009, 10:15 AM

This is completely normal. Think of it like this: The phone part (your phone calls and texts) connects to their phone network, while data transfer connects to their data network.

You don't see this on GSM phones, only on CDMA. With GSM, you can still have a data connection open while on a call.

chrisnosleep · #3 (**permalink**) 10-29-2009, 10:25 AM

Thank you for the info!

Mutiny32 · #4 (**permalink**) 10-29-2009, 11:31 AM

Wirelessly posted (Sprint Touch Pro 2: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 8.12; MSIEMobile6.0) Sprint T7380)

Even though the EvDO Rev.x standard and 3gpp2 standards allow for voice calls & SMS to be transported via Ev, the carriers never implemented it due to the immaturity of voice over mobile IP at the time, specifically latency & available bandwidth variations combined with the lack of a vocoder which could compensate for this using the processing power available in devices.

This is, in my opinion, why Sprint should have implemented EvDv like their original plans were instead of wavering to Verizon & other carriers who decided to use EvDO. They would have much lower RF overhead.

Mutiny32 · #5 (**permalink**) 10-29-2009, 11:36 AM

Wirelessly posted (Sprint Touch Pro 2: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 8.12; MSIEMobile6.0) Sprint T7380)

And technically for GSM, you can NOT keep a data session open on calls barring the possibility of the radio having two sessions open at once. WCDMA can, though. Both are under the UMTS "umbrella" that people coloquially now call GSM.

chrisnosleep · #6 (**permalink**) 10-29-2009, 09:54 PM

So is this to say that on my CDMA device, my battery is going to run down faster during a phone call versus someone standing next to me on a GSM device?