I assumed it would need to be a credit card hence my query.
I tried a Voxi sim, for the free social media.I paid to Vodaphone via PayPal,which only has a debit card attached,definitely NO credit card attached.
When account was set up I clicked, unblock adult content it was done,no questions asked.
It then said your account has been updated.
The change can take up to 48 hrs .