Contact National Savings and Investments by telephone on the number 0808 500 7007, or dial +44 1772 329880 if calling from outside the UK.
Phone NS&I using their customer service number 0808 500 7007 for enquiries related to your HM treasury backed premium bonds or ISA account. Customers can also phone this number to manage their NS&I investment, for example to add a phone number to an online account.
NS&I Customer support number – 0808 500 7007
Customers can phone the NS&I customer service team to sort out problems with their account. Issues that can be dealt with over the phone range from difficulties in logging in to an account, to needing support with transferring money from or to an account.
When NS&I customers experience difficulties logging into their account they might be notified with a warning that they have reached their trusted device limit. At this stage they should phone NS&I to get support with logging in.