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Before updating iOS, check that your iPhone supports the release, make and verify a backup, connect to Wi-Fi and power, and check available storage. Apple recommends backing up before an update; its usual manual route is Settings > General > Software Update.
What should you do before updating your iPhone?
- Check compatibility. Find your iPhone model and compare it with Apple’s current compatibility list for the release you plan to install. Apple’s iOS 26 guide lists supported devices from the iPhone 11 family and iPhone SE (2nd generation and later) through the iPhone 17 family and iPhone Air; support varies by release, so check the current list rather than relying on an older one. Apple’s iOS 26 guide and compatibility list
- Make a backup and confirm it completed. For an iCloud backup, connect to Wi-Fi, open Settings > [your name] > iCloud > iCloud Backup, then tap Back Up Now. Stay connected until it finishes; the screen shows the date and time of the most recent backup. Apple says automatic iCloud backups require the feature to be enabled, the iPhone connected to power and Wi-Fi, and its screen locked. Apple’s iCloud backup instructions
- Check device storage. Open Settings > General > iPhone Storage to see available space. If you need more, Apple suggests enabling Offload Unused Apps or deleting apps manually. During an update, the iPhone may temporarily remove app data that can be downloaded again; Apple says this does not affect personal information. Apple’s update troubleshooting steps
- Arrange a reliable connection and power. Use Wi-Fi and connect the iPhone to a power source. Keep it connected to power while installation is in progress. If the download is slow, Apple recommends using Wi-Fi and avoiding other downloads at the same time. Apple’s update instructions and troubleshooting
Choose a backup method
iCloud is convenient if you have enough iCloud storage and a Wi-Fi connection. If an iCloud backup cannot complete because storage is insufficient, Apple offers on-screen steps to buy more; that is one option, not a requirement for updating. You can instead back up to a computer. Apple’s computer instructions require a trusted computer and a connection to the iPhone. iCloud backup guidance · Computer backup and update guidance
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Apple iPhone 14, 128GB, Midnight - Unlocked (Renewed) | $300.00 | Buy on Amazon |
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Start the iOS update
Update on the iPhone
Open Settings > General > Software Update. If an update is available, tap Download and Install and follow the prompts. Automatic installation may take place overnight when the iPhone is charging and connected to Wi-Fi; Apple says it notifies you before installation. Apple’s iOS 26 guide · Apple’s iPhone User Guide
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsUpdate with a computer
If wireless updating is unavailable or keeps failing, Apple supports updating through a computer. Back up first and connect the iPhone to a trusted computer. Apple’s instructions use Finder on macOS Catalina or later, and iTunes on macOS Mojave or earlier or Windows. If the computer is using the iPhone’s Personal Hotspot, connect the computer to another Wi-Fi or Ethernet network instead. Apple’s computer-update instructions
#1 Best Overall
- This phone is unlocked and compatible with any carrier of choice on GSM and CDMA networks (e.g. AT&T, T-Mobile, Sprint, Verizon, US Cellular, Cricket, Metro, Tracfone, Mint Mobile, etc.).
- Please check with your carrier to verify compatibility.
- The device does not come with headphones or a SIM card. It does include a generic (Mfi certified) charging cable.
- Tested for battery health and guaranteed to have a minimum battery capacity of 80%.
If the update will not install
Apple identifies incompatibility, insufficient storage, a slow download, trouble reaching the update server, and an incomplete update as possible causes. Work through these steps:
Quick Recap
Best Value
- 6.1" Super Retina XDR OLED, HDR10, 800 nits (HBM), 1200 nits (peak), 2532x1170px at 460ppi, 4005mAh Battery
- 8GB RAM, Apple A18 6-core CPU (2 performance + 4 efficiency cores), Apple GPU 4-core, 16‑core Neural Engine
- Rear camera: 48MP, f/1.6, wide, Front Camera: 12MP, f/1.9, wide, iOS 18.3.1, upgradable to iOS 18.5
- Connectivity: Global 4G LTE, Sub-6 GHz 5G, LTE, Wi-Fi 6, Bluetooth 5.3, NFC, USB-C, Wireless Charging (7.5W). (does not have mmWave 5G or MagSafe or physical SIM card) - Dual eSIM Only
- Unlocked for freedom to choose your carrier. Compatible with both GSM & CDMA networks. The phone is unlocked to work with all GSM Carriers & CDMA Carriers Including AT&T, T-Mobile, Verizon, Straight Talk., Etc.
Rank #4
- This pre-owned product is not Apple certified, but has been professionally inspected, tested and cleaned by Amazon-qualified suppliers.
- There will be no visible cosmetic imperfections when held at an arm’s length.
- This product is eligible for a replacement or refund within 90 days of receipt if you are not satisfied.
- Product may come in generic Box.
Rank #3
- 6.1inch Super Retina XDR display. Aluminum with color-infused glass back. Ring/Silent switch
- Dynamic Island. A magical way to interact with iPhone. A16 Bionic chip with 5-core GPU
- Advanced dual-camera system. 48MP Main | Ultra Wide. Super-high-resolution photos (24MP and 48MP). Next-generation portraits with Focus and Depth Control. 4X optical zoom range
- Emergency SOS via satellite. Crash Detection. Roadside Assistance via satellite
- Up to 26 hours video playback. USB C, Supports USB 2. Face ID
Rank #2
- 6.1" Super Retina XDR OLED, HDR10, Dolby Vision, 1000nits (typ), 2000nits (HBM), 2556x1179px at 460ppi, 3561mAh Battery
- 128GB 8GB RAM, Apple A18 (3nm), Hexa-core (2x4.04 GHz + 4x2.20 GHz), Apple GPU 5-core, 16‑core Neural Engine
- Rear camera: 48MP, f/1.6, wide + 12MP, f/2.2, ultrawide, Front Camera: 12MP, f/1.9, wide, iOS 18, upgradable to iOS 18.5
- 4G LTE: 1/2/3/4/5/7/8/12/13/14/17/18/19/20/25/26/28/29/30/32/34/38/39/40/41/42/48/53/66/71, 5G: n1/2/3/5/7/8/12/14/20/25/26/28/29/30/38/40/41/48/53/66/70/71/75/76/77/78/79 - Dual eSIM
- Unlocked for freedom to choose your carrier. Compatible with both GSM & CDMA networks. The phone is unlocked to work with all GSM Carriers & CDMA Carriers Including AT&T, T-Mobile, Verizon, Sprint., Etc.
- Confirm your iPhone model supports the iOS release.
- Use a reliable Wi-Fi connection and pause other downloads; try a different network if needed.
- Free device storage if the update reports that space is insufficient.
- Keep the iPhone connected to power during installation.
- If the wireless update still fails, try updating with a Mac or iTunes. Apple also provides steps to delete the downloaded update and download it again.
Apple’s update troubleshooting guide
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
