Lost mobile data with an exclamation mark, I can still make calls.

Edit: added details.

I have had my Nexus 6 for 3 days and first installed my Straight Talk SIM yesterday. Everything worked fine for less than a day then I started getting MMS picture messages failing. Now I get no mobile data. I swapped my SIM with my wifes, also on straight talk and mine with hers and I get the same issue and mine works fine in her phone.

I have rebooted many times, I have checked my APN settings and even have tried alternatives.

I have done a few searches and see other have this or very similar issues but I have not found anything that fixes my issue.

I am running Pure Nexus with the stock kernel.

Flashed HTC One M8 Stock Recovery, Updates Result In Red Exclamation Mark

Hello! This is my first post here, mostly driven by my need to download a patch for Stagefright.

My bootloader is unlocked and I am rooted. I was running TWRP up until now, but I want to patch stagefright so I decided to re-flash the stock recovery. Now, whenever I allow my phone to update, it goes straight to a red exclamation mark inside a triangle.

Firstly, I have an AT&T HTC One M8. Here is what fastboot says:

S-ON
HBOOT: 3.19.0.0000
Radio: 4.0.U60511@50319A
OpenDSP: v47.2.-00564-M8974_F0.1024

My OS and other software versions are

Android 5.0.2

HTC Sense: 6.0

Software: 4.28.502.1

HTC SDK API level: 6.55

Kernel Version: 3.4.0

Baseband Version: 4.0.U605611

Build Number: 4.28.502.1 CL51189 release-keys

I would greatly appreciate your assistance. As it stands, I am very stressed out.

Flashed HTC One M8 Stock Recovery, Updates Result In Red Exclamation Mark

Hello! This is my first post here, mostly driven by my need to download a patch for Stagefright.

My bootloader is unlocked and I am rooted. I was running TWRP up until now, but I want to patch stagefright so I decided to re-flash the stock recovery. Now, whenever I allow my phone to update, it goes straight to a red exclamation mark inside a triangle.

Firstly, I have an AT&T HTC One M8. Here is what fastboot says:

S-ON
HBOOT: 3.19.0.0000
Radio: 4.0.U60511@50319A
OpenDSP: v47.2.-00564-M8974_F0.1024

My OS and other software versions are

Android 5.0.2

HTC Sense: 6.0

Software: 4.28.502.1

HTC SDK API level: 6.55

Kernel Version: 3.4.0

Baseband Version: 4.0.U605611

Build Number: 4.28.502.1 CL51189 release-keys

I would greatly appreciate your assistance. As it stands, I am very stressed out.