My wife has lost her sim Card while on vacation and has purchased a new one. She has attempted to activate the new sim using her existing phone number but the systems does not allow this.
She doesn't need to activated new sim card, just login her account and change sim card number to the new one. Since PM website has caches issue, so clear caches , cookies then using computer and private or incognito mode browser to login. For some mysteriously reasons, mobile device some times hard to login, so don't use mobile device to login.