Click the profile icon in the top right of your portal, and navigate to 'My Purchases'. The details of all phone numbers and other subscriptions you've purchased are displayed in table format. Click on a subscription/phone number to edit/update the details and view its payment history. You can also pay overdue subscriptions from here.

When a subscription nears its expiry date, you will receive a warning in your Notification Centre ('bell' icon in the top bar).

If you are currently using the old user portal:

In Subscriptions you can view the status of each of your subscriptions, as well as renew and pay overdue subscriptions. Please note: long numbers and short code subscriptions are critical to keeping two-way services running. This means it's really important for you to keep subscriptions active (paid). We will send emails to remind you but you can also enable auto renewal of your subscriptions on the bottom of the Subscriptions page.