Q: getting slow LTE speeds on 5s

Hello there dmaynard83,

It sounds like your LTE speed is lower than expected, but seems ok for a bit if you toggle Airplane mode on then off. I would use the troubleshooting from the following article to help resolve issues with the cellular data network:

iPhone: Troubleshooting a cellular data connection

http://support.apple.com/kb/TS3780

1. Restart your iPhone.
2. Make sure that your software is up to date:
   • Check for a Carrier Settings Update: Tap Settings > General > About.
   • Check for an iOS Software Update: Tap Settings > General > Software Update.
     Note: Some updates may require a Wi-Fi connection.
3. Remove the SIM Card and reinsert it. Allow the iPhone to acquire the network again.
4. If your SIM card has SIM PIN enabled, try turning it off: Tap Settings > Phone > SIM PIN.
5. Try another location. If a different location works, but the original location still doesn't, contact your carrier to report the issue.
6. Reset network settings: Tap Settings > General > Reset > Reset Network Settings.
7. Restore the iPhone as new.
8. Contact your carrier to:
   • Verify that the iPhone is properly set up on the account with the appropriate, current data plan.
   • Verify that there are no account-related blocks.
   • Find out if there are specific error messages in the carrier logs that could help determine why the issue is occurring.

If none of the above steps resolves the issue, contact your carrier, make an appointment at an Apple Retail Store, or contact AppleCare to troubleshoot further.

Thank you for using Apple Support Communities.

Regards,

Sterling

Excellent! Thanks for the update, I'm happy to know your phone is working correctly again.