Could Not Activate Cellular Data Network PDP Authentication Failure?

[cellulartalk]

Yesturday while out on errands, I noticed my service which is normally LTE went to 4G and then nothing I tried using my iPhone5s would work, I tried Facebook would not work, tried Sarafi nothing, all other apps nothing. My iPhone kept telling me this message, so what does it mean, how can I fix...

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Courtesy of WestNet Wireless
www.westnet.ca