Hi @Moe123,
I'm not sure if I've completely understood, normally when you upgrade this will be a new device plan, and an upgrade to your airtime plan for your SIM, or do you mean you purchased a new phone separately?
If you mean you have a SIM plan which hasn't been upgraded then you can usually get in touch anytime after your 90 days into the plan. You can login on My3, contact us, or pop into store with photo ID, and we'll be able to confirm if there's any early upgrade fees to pay or not.
We have started anytime upgrades recently, so usually if you're taking a new device on an equal or higher plan you will be eligible to upgrade past the first 90 days, and subject to credit and affordability checks.
Hope this helps,
Jonathan
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