finish the trail period

Should be in July, however, if you activate after the 11 of April you will loose some privileges aka the launching price when the stabilization period will end
https://fizz.ca/en/faq-stabilization-period

Essentially they will stop being offered in July. You keep intro prices if you sign up before April 12th and don’t change you plan after that date.
Info from Fizz: What will happen to my price after the stabilization period?
For members who will have subscribed BEFORE April 12, 2019.
Once the stabilization period is over, your plan will return to its launch (introductory) price. Please note, however, that if you change your plan after the stabilization period, regular prices will apply. You will be notified of the end of the stabilization period one month in advance.

For members who subscribe ON, OR AFTER, April 12, 2019.
Once the stabilization period is over, regular prices will come into effect and will therefore apply to your plan. You’ll be happily surprised by these once the stabilization period has come to an end. You will be notified of the end of the stabilization period one month in advance.
https://fizz.ca/en/faq-stabilization-period