Question about switching to O2 monthly contract

[jojka90210]

Hi, I am planning to switch from my current SIM only contract with 3 which ends on the 27th of this month to a new SIM only contract with O2, but am not sure on when the best time to do this is. I have already told 3 I am leaving them and have received my PAC code, but I am not sure when I should buy my new O2 sim. 

I would like to avoid paying for 2 contracts at the same time, so I am hesitant to buy the new SIM from O2 immediately and wait for the 28th to move over. Can anyone let me know if the O2 contract starts from when i buy it or when I put it in my phone and use it first? thanks

[gmarkj · Accepted solution]

o2 will start you the day the order is placed @jojka90210 but you can get them to refund a few days between the contract starting and the sim arriving.

Best time to port would be once the o2 sim has arrived and you have confirmed it working.

Guide: Migration & porting into O2  

[Enlli]

The PAC issued by Three is valid for 30 days. So you should be in the time frame

[Bambino]

@jojka90210 Also bear in mind that O2 doesn't port numbers on the weekend, so you're best to start the process early in the week, whichever week you choose.