There's currently a bug in HipChat that causes issues witn non-US numbers for SMS. If you're using a US number, I would contact HC support at email@example.com or through help.hipchat.com to investigate further. The related info on their help site is http://help.hipchat.com/forums/138883-suggestions/suggestions/3853306-fix-sms-replies-for-international-non-us-numbers-a
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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