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There is no single iPhone setting called “Auto Network Switch.” The right setting depends on what you want: use cellular data alongside a weak Wi-Fi connection, fall back to cellular when Wi-Fi is unavailable, automatically join a saved Wi-Fi network, or join a nearby Personal Hotspot. Apple’s current iPhone guide is for iOS 26; labels and availability can vary by iOS version and region.
Use cellular data while connected to Wi-Fi
To let cellular data supplement Wi-Fi on a particular network, turn on Apple’s Use Connectivity Assist option for that network. This may use cellular data and count against your plan; allowances and charges depend on your carrier.
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Apple iPhone 14, 128GB, Midnight - Unlocked (Renewed) | $300.00 | Buy on Amazon |
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Apple iPhone 16, 128GB, Pink - Unlocked (Renewed) | $552.01 | Buy on Amazon |
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Apple iPhone 15, 128GB, Black - Unlocked (Renewed) | $398.00 | Buy on Amazon |
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Apple iPhone 13, 128GB, Midnight - Unlocked (Renewed) | $262.00 | Buy on Amazon |
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Apple iPhone 16e, 128GB, Black - Unlocked (Renewed) | $388.00 | Buy on Amazon |
- Open Settings and tap Wi-Fi.
- Tap the Info button next to the connected network.
- Turn on Use Connectivity Assist, if it appears.
Apple describes this control as using cellular data in addition to Wi-Fi. See Apple’s Manage Wi-Fi settings on iPhone.
Let iPhone fall back to cellular when Wi-Fi is unavailable
You do not need to enable Use Connectivity Assist for ordinary fallback: Apple says iPhone automatically connects to your carrier’s cellular data network if a Wi-Fi network is not available. This is different from using cellular data in addition to an available Wi-Fi connection. See Apple’s guide to connecting iPhone to the internet.
#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%.
Choose whether iPhone automatically joins a saved Wi-Fi network
Auto-Join controls whether iPhone joins a specific known Wi-Fi network automatically. Turn it off to keep the network saved but connect to it manually.
- Open Settings > Wi-Fi.
- Tap the Info button next to the network.
- Turn Auto-Join on or off.
To remove the saved network instead, choose the option to forget it. Forgetting removes the network and its saved password; it is not the same as switching off Auto-Join. Apple explains both choices in its guides to how Apple devices decide which known wireless networks to auto-join and forgetting a Wi-Fi network or preventing automatic joining.
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.
Set automatic joining for a nearby Personal Hotspot
Hotspot joining has its own preference, separate from cellular fallback and saved Wi-Fi Auto-Join.
- Open Settings > Wi-Fi.
- Tap Auto-Join Hotspot.
- Choose an available preference, such as Ask to Join or Automatic.
For details, see Apple’s instructions for using Instant Hotspot.
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
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.
