
JETech specifies this cable for the Apple 30-pin dock connector on iPhone 4 and iPhone 4s.
This is for the legacy 30-pin dock connector only; it does not fit Lightning or USB-C iPhones.
Everything below is checked against this exact model, not the product line. Where the fit has a condition, it is written out.
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Marked required because the device is meaningfully harder to use without them.

JETech specifies this cable for the Apple 30-pin dock connector on iPhone 4 and iPhone 4s.
This is for the legacy 30-pin dock connector only; it does not fit Lightning or USB-C iPhones.

KabelDirekt
KabelDirekt specifies the 30-pin end for iPhone 4/4s and a USB-C host or adapter connection.
This is for the legacy 30-pin dock connector only; confirm the USB-C power source supports standard USB charging.

kwmobile's first-party compatibility material identifies the Soft TPU Case as molded for iPhone 4 and iPhone 4s.
2 products checked against iPhone 4.

iOttie's adjustable cradle accepts phones up to 3.6 inches wide, covering every target iPhone chassis.
Safe use: Confirm that the phone and case fit within the 3.6-inch cradle width and mount only on a safe, unobstructed vehicle surface.

Spigen specifies the TS35-1 universal clamp for most smartphones and cases rather than a proprietary phone shell.
Safe use: Verify the case sits securely in the clamp and keep the mounted phone clear of the driver's view and vehicle controls.
2 products checked against iPhone 4.

kwmobile's first-party compatibility material identifies the Soft TPU Case as molded for iPhone 4 and iPhone 4s.
Before you buy: Use only with the exact iPhone model or shared-fit group named; camera, button, and port geometry differs across other iPhones.

OtterBox's first-party compatibility material identifies the Defender Series Case as molded for iPhone 4 and iPhone 4s.
Before you buy: Use only with the exact iPhone model or shared-fit group named; camera, button, and port geometry differs across other iPhones.
2 products checked against iPhone 4.

JETech specifies this cable for the Apple 30-pin dock connector on iPhone 4 and iPhone 4s.
Fit limitation: This is for the legacy 30-pin dock connector only; it does not fit Lightning or USB-C iPhones.

KabelDirekt specifies the 30-pin end for iPhone 4/4s and a USB-C host or adapter connection.
Fit limitation: This is for the legacy 30-pin dock connector only; confirm the USB-C power source supports standard USB charging.
2 products checked against iPhone 4.

JOBY specifies the spring-loaded stand for both small and large smartphones, covering the compact iPhone 4/4s chassis.
Before you buy: Confirm the spring clamp grips the phone or case without pressing a side control.

Nulaxy's open universal smartphone cradle has no model-specific shell and supports portrait or landscape placement.
Before you buy: Center the phone on the cradle and remove oversized rear-mounted accessories if they prevent stable contact.
2 products checked against iPhone 4.

JOBY supplies HandyPod 2 with a universal smartphone clamp and documents a phone width limit up to 3.46 inches.
Before you buy: Confirm the phone or case sits securely in the clamp and keep the tripod on a stable surface.

Ulanzi specifies a 2.29-to-3.3-inch clamp range, covering the widths of the non-Qi legacy iPhones.
Before you buy: Measure the phone with its case and position the clamp so it does not press a side button.
2 products checked against iPhone 4.

Ringke's two-card holder attaches to a flat phone case with replaceable 3M adhesive and does not depend on model-specific magnets.
Before you buy: Attach to a smooth compatible case or use the recommended protective film on glass; remove before wireless charging when it interferes.

Sinjimoru specifies its flexible adhesive pouch for smartphones with enough flat rear area, independent of the phone connector or magnet system.
Before you buy: Use a smooth case or supplied adhesion film on glass; verify the pouch does not cover the camera and remove it if it obstructs wireless charging.
2 products checked against iPhone 4.

Anker documents a regulated USB-A output; each iPhone charges through the correct USB-C, Lightning, or 30-pin cable selected on its cable page.
Required specification: Use the correct cable for the iPhone connector; this power bank does not include every legacy cable.

Anker documents both USB-C PD and USB-A outputs, allowing every target iPhone to charge through its correct cable.
Required specification: Use the correct cable for the iPhone connector; actual charging speed is negotiated by the phone.
2 products checked against iPhone 4.

Supershieldz lists this PET protector for the exact display dimensions and cutout geometry of iPhone 4 and iPhone 4s.
Before you buy: Install only on the exact model or shared display-fit group named and remove any existing screen film first.

Supershieldz lists this tempered glass protector for the exact display dimensions and cutout geometry of iPhone 4 and iPhone 4s.
Before you buy: Install only on the exact model or shared display-fit group named and remove any existing screen film first.
Fit rarely carries across generations, so each has its own guide.
Every verdict on this page was read off manufacturer documentation, published specifications, or a product listing, and each one links to the source it came from. Nothing here is tested in a lab, and we say so rather than implying otherwise.
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