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Why no 3G or LTE while in a phone call?

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fifedogg
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Default Why no 3G or LTE while in a phone call?

If I remember correctly I could use Data while on the phone on my M7, why am I not able to on the M8? Running ViperRom and have full LTE service but can't talk and use data at the same time...
 
calinormy
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The same is happening in S5....

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BD619
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Frequently Asked Questions - HTC One-M7-Sprint(m7wls) | HTC Evo 4G LTE(Jewel) | HTC One-M8-Sprint(m8_whl)
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joshuaw84
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This thread will get you started http://forum.xda-developers.com/show....php?t=2698826

It's no fault of the phone, Rom or anything like that.

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Captain_Throwback
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There are threads about this here already. A search should yield results.

The bottom line is that this is not currently possible on the Tri-Band LTE devices on Sprint's network.
Device 1: HTC One (M8)/831C | Hardware Version: 0005

Baseband: 1.08.20.0612_4 | PRI: 2.62_003 | PRL: 56019
Recovery: TWRP 2.7.1.0

Device 2: HTC Jewel/PJ75100 (EVO 4G LTE) | Hardware Version: 0003

Baseband: 1.13.11.1105 | PRI: 3.02_003 | PRL: 56018
Recovery: TWRP 2.7.1.0b

Device 3: HTC Shooter/PG86100 (EVO 3D) | Hardware Version: 0002
Baseband: 1.09.00.0108 | PRI: 1.55_003 | PRL: 22100
Recovery: TWRP 2.6.3.0

Device 4: HTC Supersonic/PC36100 (EVO 4G) | Hardware Version: 0004
Baseband: 2.15.00.01.15 | PRI: 2.33_003 | PRL: 40460
Recovery: TWRP 2.7.1.0
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