Although you can access the Personal Capital application from any location, we currently only support U.S based financial institutions (with their currency in US Dollars) for linking accounts. As such, at this time as well, we only support using a valid US phone number to sign up for Personal Capital.
You do have the ability to create a manual account and track this value in US Dollars. This will require to have the account periodically updated manually. Please see this article for instructions on creating a manual account
In addition, you can add International holdings traded in the U.S. markets under US dollars. Non-US traded holdings would need be to setup under a manual investment account (as described above) and convert the value into US Dollars.