You will need to get in contact with customer service to have the account temporarily suspended you can reach out to them even from outside of the country through any of the available methods listed here.
A few things to note:
You need to have been with Fido for a minimum of one month and must not be in a contract.
The suspension and the monthly suspension fees will take effect on the last day of your current billing cycle.
You will have to pay for it up-front unless you have a pre-authorized payment setup.
If you are on the Fido Payment Program you will continue to pay your monthly funding amount during the suspension.