@Inna2
Check you haven't got a spending cap on the account, and have you tried to use a different network, also make sure the number is in the phone with +44 at the beginning.
If you message O2 on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) , they should be able to help you with this
Thanks
- Xperia 1V - o2 and Spusu
- Pixel 8 Pro - o2 and Vodafone UK
