Disappearing credit

[Topref]

I have an old PAYG o2 sim card which I only top up when needed (which is rarely). I topped up on-line on the 24th of June 2021 with £20 and at the time, o2 had one of their regular one-month offers of doubling the credit for 30 days. I sent just 2 texts in this time and I had a voicemail from o2 a couple of days ago saying that my credit was zero. I rang my home number from it but it didn't connect but instead, the recorded message told me to top up. I can't get a contact number to query this so can someone help? Also, would the lack of credit affect whatsapp messages being received? Thanks in advance.

[MI5]

@Topref 

You need to call 0344 8090222 from a landline or other mobile for customer services.

WhatsApp should still work on a wifi connection.

[Topref]

Apparently, the £20 was used up in ONE MONTH even though for all that time, the phone's been inside my house and on WIFI and not relying on data.

[MI5]

Did you have mobile data turned off on your phone @Topref ?

[Topref]

Probably not and if this was my mistake, cestlavie but for much of this time, the phone was switched off. Can I assume from your comment that if WIFI is present, data would still be used? Thanks

[MI5 · Accepted solution]

@Topref 

Yes it can.

Some phones will suppliment wifi with data use if the wifi signal is deemed to be inadequate or if the wifi connection is lost, it will use mobile data.

[Topref]

Phone not taken out of the house and not always switched on either. WIFI always on in the house so I'm really disappointed that it's cost me £20. I'll learn from this and thank you for the sound advice. Needless to say, Mobile data now switched off.

[MI5]

Good luck