My iphone cellular is showing issue .

It's possible that your mobile carrier has either disabled the feature you're trying to use or you might have used more data/minutes/texts than your current plan allows.

To get this resolved quickly, here are a couple of options:

1. Contact your mobile carrier's customer service: They can check your account details and confirm if the feature is disabled or if you've reached your usage limit. They can also help you troubleshoot further and potentially enable the feature again if needed.
2. Check your mobile carrier's website or app: Many carriers allow you to manage your account online. You might be able to see your current data usage, plan details, and even enable/disable features directly through their online portal.