If you run out of mobile data on Public Mobile, you have two practical choices: buy a Public Mobile data add-on or move to a plan with more data. The better choice depends on how much data you need, how close you are to renewal and whether changing plans would cost less than repeatedly buying extras.
The most important 2026 rule is easy to miss because old forum posts say something different: current Canada data add-ons expire after 30 days. Public Mobile’s current help information has been quoted in recent Community threads as saying unused data expires 30 days after purchase. Older non-expiring add-ons can still exist on legacy accounts, so check what your own account actually shows.
Do not buy an add-on before checking these three things
Running out of data creates a special kind of urgency. Your phone still works, Wi-Fi suddenly becomes precious, and every app looks suspicious. Before buying the first add-on you see, check:
- How many days are left before your plan renews. Buying extra data with one or two days left may be poor value.
- How much data you really need. A small one-time shortage and a recurring monthly shortage are different problems.
- Whether Public Mobile is showing you a better plan. Existing-customer plan options can differ from public new-customer offers.
If you are short every month, an add-on is not really solving the problem. It is renting the same problem again.
How to buy a Public Mobile data add-on
Public Mobile’s March 2026 Service Terms say customers can purchase additional data or minutes through My Account, the Public Mobile app, or by replying to an eligible SMS offer sent when a bucket is approaching its limit.
The current account flow reported in recent Public Mobile Community support is:
- Sign in to My Account or open the Public Mobile app.
- Open Subscription & Add-Ons.
- Select Shop Add-Ons.
- Choose the Data category.
- Review the data amount, price and expiry shown to your account.
- Complete the purchase and confirm the add-on appears in your account.
If you are using the web version and only see Bundles or Minutes, look for the category selector on the Shop Add-Ons page. Recent Community threads show that the Data section can be easy to miss on narrower screens.
Public Mobile’s current plans page still exposes an Add-Ons section, while the account itself is the safer place to see what is actually available to you today.
How long does a Public Mobile data add-on last?
For currently sold Canada data add-ons, the key rule is 30 days from purchase. A 2025 Public Mobile Community thread quotes the current Public Mobile help article directly: data add-ons are valid for 30 days, and unused data expires after that period.
This is where old search results can cause trouble. Public Mobile historically sold add-ons that rolled over until used. Some older accounts may still show those legacy non-expiring balances. That does not mean a newly purchased 2026 data add-on gets the old rule.
So check the expiry date shown before you confirm the purchase. If the account says 30 days, believe the current account, not a seven-year-old forum answer.
Does the add-on start immediately?
A purchased data add-on is intended to supplement your subscription. Recent Public Mobile Community guidance says plan data is used first, with eligible add-on data becoming relevant after the regular data bucket is exhausted.
The exact display and order can be confusing if your account contains multiple promotional or legacy data buckets. If you have old bonuses, expiring promotional data and a newly purchased add-on at the same time, check the usage section in My Account rather than assuming which bucket will drain first.
How much do Public Mobile data add-ons cost?
Do not rely on a fixed price copied into an article. Public Mobile’s Service Terms say the rates and conditions at the time of purchase apply, and recent Community posts show that different customers have seen different data add-on options.
For example, June 2026 Community discussions mentioned options such as 1GB and 5GB add-ons at different prices, but not every account displayed the same choice. That makes My Account the source that matters when you are actually buying.
The better question is not “what did an add-on cost in somebody else’s screenshot?” It is “does the add-on shown to me cost less than the alternative?”
Add-on or plan change: which one makes more sense?
| Situation | Usually worth checking first |
|---|---|
| You ran out once and renewal is soon | A small add-on, careful Wi-Fi use, or simply waiting for renewal |
| You run out almost every month | A plan with more recurring data |
| You need several gigabytes immediately | Compare the add-on cost with an immediate plan change |
| You have a grandfathered or promotional plan | Protect the old plan unless you are certain the replacement is better |
| You are near your renewal date | Schedule a plan change for renewal when available rather than sacrificing prepaid time |
Public Mobile plans are prepaid, so changing immediately can affect the value of time already paid for. Before making a plan change, check the current account options and the site’s Public Mobile plans guide.
Why changing plans immediately can be expensive
With prepaid service, timing matters. If you switch to another plan immediately, you should not assume Public Mobile will refund the unused portion of the old subscription period. Public Mobile’s current Service Terms say prepaid funds are non-refundable and plan changes are governed by the terms available when you make the change.
If your data shortage is not urgent, a change on renewal can preserve more value. If you need data right now, paying for an immediate change may still make sense. The point is to choose it deliberately.
What if the Data category is missing?
Recent Community threads show customers occasionally reporting that Canada data add-ons do not appear where expected.
Try these checks:
- use the Public Mobile app as well as the browser account
- open Subscription & Add-Ons, then Shop Add-Ons
- look for a Data tab or category selector
- sign out and back in if the account page looks stale
- check whether a current plan change would be a better option anyway
- if the section genuinely is missing, use the Public Mobile help centre and chat/support path
Do not keep purchasing unrelated roaming bundles because the Canada data category is hiding. That is an expensive way to solve the wrong problem.
What happens to unused data after 30 days?
For newly purchased Canada data add-ons under the current rule, unused data expires after the 30-day validity period. That means buying a large add-on “just in case” may waste money if you only need a small amount before renewal.
Legacy non-expiring add-ons are different. If your account already contains an older balance that clearly has no expiry, do not assume this article’s rule changes that existing balance. The purchase terms attached to your specific add-on matter.
What if you run out of data while travelling?
Canada data add-ons and roaming add-ons are different products. If you are outside Canada, do not assume a domestic data add-on will solve roaming. Check the current roaming coverage and add-on terms for the country you are visiting.
Public Mobile currently sells cross-border plans as well as separate add-on options. Travel products can have different validity periods from domestic data add-ons, so read the specific terms before buying.
For a related next step, read public mobile koodo switch.
Public Mobile data add-on FAQ
How do I buy more data on Public Mobile?
Sign in to My Account or the Public Mobile app, open Subscription & Add-Ons, choose Shop Add-Ons, then select the Data category. Review the amount, price and expiry shown before paying.
Do Public Mobile data add-ons expire?
Currently sold Canada data add-ons are described in Public Mobile’s current help information as valid for 30 days after purchase. Older legacy add-ons may have different terms, so check your account.
Does unused add-on data roll over?
Not for a newly purchased 30-day Canada data add-on. Older non-expiring add-ons can still exist on legacy accounts, which is why old forum answers can look contradictory.
Is it cheaper to buy an add-on or change plans?
It depends on the amount you need, how often you run out and the live prices shown to your account. If you need extra data every month, a higher-data plan is often worth comparing before buying repeated add-ons.
Can every Public Mobile plan buy data add-ons?
Availability can vary by account and current offer. Check Shop Add-Ons in My Account. If the Data category is missing, use Public Mobile support rather than assuming an old add-on list still applies.
Will add-on data be used before my regular plan data?
Your regular plan data is generally used first. Accounts with promotional and legacy data buckets can display more complicated usage order, so check My Account if you have several balances.