To receive calls and SMS on your device, follow these steps:

Setting Up SMS

1. Open the Messages App: On your iPhone, locate and open the Messages app.

2. Start a New Chat: Tap the pencil icon or "New Message" button to start a chat.

3. Enter Recipient's Details: In the "To:" field, type the phone number or select a contact from your address book for the SMS you want to send.

4. Compose Your Message: Type your message in the text field.

5. Send Your Message: Once your message is ready, tap the send button (typically an upward arrow icon).

To ensure you can receive SMS:

- Make sure your mobile plan supports SMS messaging. Check with your service provider.

Receiving Calls

1. Check Signal: Ensure you have a good cellular signal. If you're in an area with weak reception, consider moving to a location with better service.

2. Incoming Call Settings: Go to your phone’s settings and navigate to Phone > Call Forwarding. Ensure this feature is turned off unless you want calls forwarded to another number.

3. Do Not Disturb: Ensure that 'Do Not Disturb' is not active unless you want specific calls to be silenced. Go to Settings > Focus > Do Not Disturb and customize as needed.

4. Answering Calls: When a call comes in, you can swipe or tap the green button to answer it.

Troubleshooting Issues

- If you find that you're unable to receive calls or SMS:

1. Restart Your Phone: Sometimes, a simple restart can resolve connectivity issues. Hold down the power button and slide to power off, then turn it back on.

2. Check for Updates: Ensure your iPhone is running the latest version of iOS. Go to Settings > General > Software Update to check.

3. Contact Your Carrier: If problems persist, contact your mobile carrier to verify if there are any service issues or account problems impacting your phone's ability to receive calls and messages.

Following these steps will ensure that you can seamlessly receive both calls and SMS on your device. For detailed guides, you can check learn more - learn more.