Since you can't get by via a web browser can you not use the idmobile app? 

Joe

I use absolutely as few apps as possible, the phone is for making phone calls (and sending occasional messages) and nothing else.  The screen is too small for my 80 year old eyes.

Hi ​@chrisisbd,

Thank you for your message.

We are very sorry to hear that you have issues with adding number to your account.

To help fix this, please try these quick steps on your computer:

1. Open a private/incognito browsing window and try again.

2. Clear your browser cookies and cache, or try a different web browser entirely.

3. Check if your number might still be registered under an older email address you used in the past.

Thanks