My phone says unable to check for update

Hello exclusivenoe!  

Thanks for reaching out to the Apple Support Communities. I see that you’re encountering an error in updating your iPhone. I know how important it is to have the iOS on your iPhone up-to-date. Based on the errors that you’re seeing, if you’re trying to update over-the-air (using Wi-Fi), follow the steps in this article: Get help with over-the-air iOS updates. 

If you continue to have issues updating over-the-air, you can also update your iPhone using a computer with the latest version of iTunes. Follow this article to see how: Update your iPhone, iPad, or iPod touch. 

Cheers!  

Make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple. Also, see How to find your nearest Apple Authorized Service Provider (AASP) or Distributor (AAD).

"Your Apple-branded or Beats-branded hardware product (“Product”) is warranted against defects in materials and workmanship for a period of ONE (1) YEAR from the date of original retail purchase (“Warranty Period”) when used in accordance with Apple`s user manuals (refer to www.apple.com/support/country). Under this warranty, you will be able to direct your claims to Apple even in situations where you purchased the Apple Product from a third party.” [Apple One (1) Year Limited Warranty – Accessory - For Apple and Beats Branded Products Only.]

Have you tried restarting the device? what about connecting it to a computer, opening up itunes and checking for an update that way?