Upgrading to sim only

[Willde]

My contract ran out on the 4th whilst I was on holiday, if I upgrade to a sim only contract now will it automatically replace my existing bill for this month? So next month I get one small bill not two bills if the old one isn't replaced. I am still within the data/minutes.

Also will the additional costs whilst being abroad transfer to the new sim only contract?

Thank you.

[MI5 · Accepted solution]

Your old contract will end and you will get a final bill with all associated costs.
You will start a new contract from the date you upgrade which will incur a bill that needs to be paid in 14 days time.

[Willde]

So the best bet is to wait a few days before my next bill so there's minimum overlap?

[MI5]

It will all balance out the same eventually as you are billed a month in advance which will be refunded if you change your account over, so doesn't really make any difference as you are staying with the same network.