It is like the amber alert, fire alert, evacuation alert, etc that government etc agencies send out to people in a particular area, or even province wide at times. This is just a test, while other ones are not tests.
I personally didn't receive the alert (I have an Android) but my wife, also on PM, did (iPhone). We both didn't have the block alert setting on, so kind of wondering what happened!? But I'm ok with that.
I would 100% switch over, double the data for $1 more than the original $39/month plan. You would save $15 in total if you kept the $39 plan and went for 90 days, so that is also something to think about. Overall, I would imagine you aren't going to ...