Hi @Nivleen,
Upgrading will cancel your current plan, and start a new agreement. That's why you'll be seeing an early termination fee. Usually you can increase your plan mid contract term without having to upgrade though. We refer to this as a price plan change.
As @MZone says, check out your options for managing your plan in My3, or get in touch and we should be able to check if there's an appropriate option.
Thanks,
Jonathan
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