Best time to change tariff to avoid pro rata billing?

[Viewfinder]

As per subject - from your experience, when is the best time to switch tariff and have no or as little pro rata split billing periods? I have been on simplicity for a while now and it doesn't have an inclusive data allowance other than web daily. I could add a data bolt on but not sure if I an best switching to a similar tariff with inclusive or stay as I am with bolt on.  It will be very low usage for email etc and not for any excessive browsing!

I also want to keep to the 1 month rolling contract and not have to change this.  If I want to change tariffs and go for a tariff with a little bit of data such as the 100 or 300, when is the best time to switch without much of an overlap?

Granted that a change of tariff might incur some delay or overlap, I don't mind a day or so.  I have searched the forums and there are incidents of some double billing etc so just wanted some clarification.  Is it usually a day before next billing date or some time else?

Thanks!

[Toby]

Ok, I think it should work now :). Please try one more time haha.

[Cleoriff]

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@Toby wrote:
Ok, I think it should work now :). Please try one more time haha.

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I have to commend you for all this effort @Toby Above and beyond....

[Viewfinder]

Thanks @Toby, here goes a test post...

[Viewfinder]

Sadly still no edit...

I echo @Cleoriff's commendation - appreciate all your help. The only other option is that I can't make any mistakes when posting so don't need to edit!

From my troubleshooter days, I always like to get to the root cause of these problems rather than workarounds, but if it helps, could always delete my user and recreate if it's possible to keep same username? Can I get an extra special badge too?

[Toby]

Ok, back to the drawing board.....

[Cleoriff]

An extra special badge @Viewfinder ? Certainly..I will go and make one now...

[Toby]

One more time please @Viewfinder. There is an issue that I'll need to to look into if it persists. We'll also take this to PM if it continues  

[Viewfinder]

@Cleoriff Ha ha that sounds very ominous!

[Viewfinder]

@Toby, sorry for delay, have just checked and still no Edit, happy to take to PM as I too I'm conscious it's off topic and may confuse others when thread gets bumped up... Cheers.