I was using a public mobile for 8 months and then I went outside of Canada for like 4 months. Now, when I inserted my sim, it shows 'No Service'. I think my sim might have been blocked. I think I have forgotten my account password, but I remember the Email address. I try to go to 'forget my password' thing, it asks for email, I give correct email, but then it gives some kind of written error like "login_disabled"
After 90 days inactive you're sim no longer valid, account closed and number gone.
You'll have to buy a new sim and create new account with different email address.