If you encounter the message "Charstar is temporarily offline," you may need to subscribe to use the service via the iPhone app. Follow these steps to resolve the issue:

1. Download the Charstar App: If you haven’t already, download the Charstar app from the App Store. You can find it here - [learn more].

2. Open the App: Launch the Charstar app on your iPhone or iPad.

3. Sign Up or Log In: If you are a new user, sign up for a new account. Existing users can log in using their credentials.

4. Subscribe: Look for subscription options within the app. There may be various plans available, such as Charstar Plus for unlimited messaging without ads. Select your preferred subscription and follow the prompts to complete the purchase.

5. Check Connection: Ensure that your internet connection is stable. Sometimes, connectivity issues might lead to service interruptions.

6. Contact Support: If you continue facing issues, you can reach out to Charstar support through their website for further assistance. Visit the support page here - [learn more].

By completing these steps, you should be able to access Charstar services once your subscription is active.