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Does iPhone 5S rely on eCSFB?


tigmd99
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I know that the new Android tri-band devices rely on eCSFB/CSFB to get calls across to your phone while on LTE.  

 

Does the iPhone also use eCSFB when it connects to LTE?  That is, if a tower has LTE 800 but has not had the eCSFB upgrade, then can iPhone 5S connect to it AND also receives calls?

 

I read somewhere on this forum that iPhone rely on something else to do this. 

 

Thanks.

Edited by tigmd99
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I know that the new Android tri-band devices rely on eCSFB/CSFB to get calls across to your phone while on LTE.  

 

Does the iPhone also use eCSFB when it connects to LTE?  That is, if a tower has LTE 800 but has not had the eCSFB upgrade, then can iPhone 5S connect to it AND also receives calls?

 

I read somewhere on this forum that iPhone rely on something else to do this. 

 

Thanks.

http://s4gru.com/index.php?/blog/1/entry-357-nexus-5-and-lg-g2-experience-temporary-sprint-lte-connectivity-issues-due-to-circuit-switched-fallback-technology/

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From what we know, the iPhone's don't rely on CSFB. From what I have gathered, when they are connected to LTE, they switch back to 1x/3G every couple of seconds so that they can check to see if their is a text or phone call coming to your phone. You won't notice if it is switching back real quick, because it only takes a fraction of a second to do so.

 

-Anthony

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From what we know, the iPhone's don't rely on CSFB. From what I have gathered, when they are connected to LTE, they switch back to 1x/3G every couple of seconds so that they can check to see if their is a text or phone call coming to your phone. You won't notice if it is switching back real quick, because it only takes a fraction of a second to do so.

 

-Anthony

Ok...that's what i read i think...but i wasn't sure.  So, this is why iPhones don't have to wait for update to use LTE800....

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Ok...that's what i read i think...but i wasn't sure.  So, this is why iPhones don't have to wait for update to use LTE800....

I wouldn't say that CSFB has do with 800 LTE in particular, it's more for LTE in general. The iPhone 5S is able to connect to 800 LTE because Apple probably has it enabled out of the box, because Apple does with their phones what they want. Whereas with Android and the other manufacturers, they are at the will of the cellular companies, so the people with Android will have to wait until Sprint decides to let them use it.

 

-Anthony

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"The iPhones are neither Triband nor SVLTE. They are capable of using CFSB,and use that feature on WCDMA networks. However, they do not use CSFB on the Sprint network as far as I know. But please understand that CSFB is not a device feature, but rather a network feature. It's just that a device transmission path design would necessitate its use.

The iPhone 5S and 5C are only dual band LTE on the Sprint network. But that probably explains why Apple chose to omot the third band and go the route of their devices using CSFB on the Sprint network.

The new iPhones are the same as the older single band iPhone 5 on the Sprint network, just with one more additional LTE band. They do not support SVLTE. I do not have enough understanding of Apple devices to explain why."

 

-Robert

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