O2 Sim Only O2 is one of the networks in UK with O2 sim only offers available known as Simplicity. The name suggests that O2 sim deals are simple to subscribe with no string attached so you can unsubscribe anytime you want as long as you give a 30-day notice.

The no-string attached policy is also making the consumers happy since they can change whenever they want without hassle.

You can change your plan to Simplicity if you have using O2 pay monthly plans or pay as you go plans. O2 sim deals are aimed at those who want to get a call plan without getting a new phone.