Hello! I'm Emily Roberts, and I'd be happy to help you with your issue purchasing Facebook Stars through Mobily. Let's try to get to the root of the problem together.

From your description, it sounds like there could be a few potential reasons why you're experiencing difficulties. Let's go through some common solutions:

1. Payment Method Issues: Sometimes, payment method issues can prevent purchases. It's worth checking if your payment method linked to your Mobily account needs an update or if there are sufficient funds available. You can update your payment method in the Facebook payment settings or through the App/Play Store 4.

2. Account or App Issues: Ensure that your Facebook app is updated to the latest version, as updates may affect how services work, including purchasing Stars. If you haven't updated your app recently, consider doing so.

3. Disabled Facebook Payment Account: There could be an issue with your Facebook payment account being disabled, which would prevent star purchases as well 9.

4. Regional Restrictions or Changes: It's possible that Facebook has changed the availability of purchasing options for certain regions or methods. This means some options might not be available on mobile browsers, but they're available on specific devices 2.

5. Technical Issues on Facebook's Side: Sometimes, Facebook itself encounters technical issues affecting star purchases. You might want to check community forums or Facebook's help center for any announcements regarding service disruptions 6.

Let's start by checking your payment method and ensuring your Facebook app is up-to-date. Are there any of these potential issues you think might be affecting your ability to purchase Stars?

If none of these steps work, you might need to reach out to Facebook's support to see if they can provide further insights into this particular case. Let me know if there's anything specific you'd like more information about!