data (3g) switches off while on call

[afgzee]

When I'm on a call my mobile data switches off, sometimes I need this to access information when contacting a company but can't get access to the Internet. On my Nokia lumia 930, data remains on even during a call. What's up with this? And how to fix?

Thx

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[Morutimeru]

If you are on a CDMA network (Verizon / Sprint) that's a limitation of the network. Some CDMA phones use a workaround that consist in having to radios on the same phone or using volte.

Sent from my Nexus 6 using Tapatalk

 

[afgzee]

Thanks. I'm in the UK and use BT Mobile putting my BT sim in my lumia and data remains active. Must be a limitation of android. How terrible.

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[Mooncatt]

Must be a limitation of android. How terrible.

Like Morutimeru said, it's more likely a phone manufacturer/carrier limitation and not Android itself. In the U.S., it used to be that no 3G phone could talk and surf at the same time (4G being a different story). I don't know much of the technical details, but I remember seeing a discussion on here when ATT made an update that allowed talk and data at the same time on 3G. It was pretty big news at the time. Whether it was using two radios in the phones or a change in how the existing connections were made, I don't know. But being on an Android forum, it was certainly affecting Android phones.

 

[Super Dave426]

I'm on Sprint and I know that is a limitation, the radio and internet use the same antenna or radio so it's one or the other. The LTE symbol at the top disappears during a call.

Sprint’s Spark LTE network disables data when handling calls | Ars Technica

Sprint offered a statement to Consumer Reports confirming the issue, stating, "Simultaneous voice and data sessions are not available on tri-band devices unless the customer is using WiFi." That may be cold comfort to stranded smartphone addicts who have become accustomed to juggling calls, maps, and Web searches, but at the very least, their resulting reduced data use may be less likely to be hit by data throttling.

Another article that really goes in depth explaining the issue and will cost too much to reslove:

Nexus 5 and LG G2 experience temporary Sprint LTE connectivity issues due to Circuit Switched Fallback technology - S4GRU Sprint 4G Rollout Updates

Up until these new Triband devices, previous Sprint LTE devices supported simultaneous voice and LTE (SVLTE). It could do so with two separate transmission paths from the antennas to the chipset. Voice/texting could run via 1xRTT on one transmission path. LTE could run a separate path, allowing data and voice to be used simultaneously.

In contrast, Sprint Triband LTE devices do not support two separate transmission paths. They have one path, shared by voice/SMS and data. We were alerted to this months in advance. However, we did not realize that the network would have to run on Circuit Switched Fallback in order for this to work and what the ramifications of this would be.

S4GRU was told by a source this past summer that Sprint and the OEM’s came to the conclusion that these new Triband LTE devices could not use SVLTE in the conventional way they used to, and it would require a lot of engineering, testing and cost to even attempt such a design change. It was decided to release Triband LTE devices without SVLTE. It may seem that the only drawback for doing that is Sprint Triband LTE devices would not be able to run simultaneous LTE data while on a phone call or when actively transmitting a text. But there is another. And it’s why many early adopters of these new Triband LTE smartphones no longer are being able to connect to Sprint LTE in many places that they used to.