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4.4.4 Tethering Stops During Phone Calls

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Default 4.4.4 Tethering Stops During Phone Calls

I haven't seen any reports of bluetooth or wifi tethering not working while in a phone call but that is what is happening to my nexus 4. I'm using Purity rom with a hybrid radio and have LTE enabled. Whenever I make a phone call, the data connection type letter on the signal bars in the notification drop down disappears. It's like the data connection completely stops.

If I am not tethering and make a phone call, the data connection type letter stays active and I can use the connection with various apps. It only seems to cut out when I am tethering with either bluetooth or wifi. Is this a normal problem? I was thinking I might have to apply the tmobile tethering fix:
to fix it but wasn't sure it was still really necessary in 4.4.4 or that this problem was even related. I thought that fix was for if you kept being redirected to the upgrade page of tmobile. My plan is truly unlimited 4g (not the 2gb of high speed data then throttling down to 2g speeds) and tethering is included. I'm not being redirected anywhere. The data connection just stops. I was thinking this was a problem with 4.4.4 since it has never happened to me on other versions.
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I'm pretty sure that the way Mobile data works makes it impossible to both call and receive data at the same time.

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