Hello there, knitterabs.
It sounds like you're having issues not receiving calls or texts on your iPhone 5s. The following Knowledge Base article offers up some great steps for troubleshooting calls not being received:
If you can‘t send or receive messages on your iPhone, iPad, or iPod touch
Find out what to do if you see "No service" or "Searching" in the status bar. If you can't make or receive calls on your iPhone, follow these steps, testing after each:
- Turn airplane mode on and off. Tap Settings > Enable Airplane Mode, wait five seconds, then turn airplane mode off.
- Check your Do Not Disturb settings. Tap Settings > Do Not Disturb.
- Check for any blocked phone numbers. Tap Settings > Phone > Blocked.
- See if Call Forwarding is turned on. Tap Settings > Phone > Call Forwarding.
- Check for a carrier settings update.
- Check for an iOS software update. Some updates might require a Wi-Fi connection.
If your iPhone has a SIM card, remove the SIM card, then reinsert it.
When you contact your carrier, check the following:
- Your account is set up to use your iPhone.
- There aren't any localized service outages.
- Your account doesn't have a billing-related block.
- Your calls don't have errors on the carrier system.
- Reset your network settings. Tap Settings > General > Reset > Reset Network Settings. This will erase all current saved settings, including Wi-Fi passwords, preferred networks, and VPN settings.
- Try to make or receive calls in another location.
- Switch to a different network band. Tap Settings > Cellular and turn off Enable LTE, 4G, or 3G (this option will depend on your carrier and device model).
If you still can't make or receive calls, restore your iPhone as new.
If restoring doesn't fix the issue, contact Apple Support or take your iPhone to an Apple Retail Store or Authorized Service Provider.
For troubleshooting sending messages, you can look over the information found here:
If you can‘t send or receive messages on your iPhone, iPad, or iPod touch
Thanks for reaching out to Apple Support Communities.
Cheers.