Answered question
I cancelled my data plan, want to add it back but did not see the option to add back after getting into "change my plan"? How can I add it back?
You should see something like this when you click on change plan. Better if you use a computer browser for that also.
If not, I suggest you get in touch with CS on the chat at
https://fizz.ca/en/faq/resolving-issues
Chizz :))
Other answers
You just have to add data into your plan the same way that you added at the first place.
.
<My plan>
<Manage Plan>
<Adjust Plan>
<Change Plan>
.
Use + to add the number of G that you want
Wait next billing cycle and it will be valis