Prior to purchasing a separate policy to cover your device, the best place to seek protection for your iPhone is through an existing insurance policy. Many insurance companies allow coverage of expensive items through another policy. Check your personal property insurance, homeowners insurance, or renters insurance to see whether an iPhone may be added and what it would cost.
A credit card may offer purchase protection for expensive purchases. It will typically cover damage or theft within the first 90 days, and may limit coverage to eligible items and purchases over a specific amount. Some credit cards also offer warranty extension plans.
Listed here are insurance policies and extended warranties available for purchase in the U.S. to specifically cover an iPhone. Terms vary widely between providers, and deductibles, coverage, and exclusions differ greatly. Read the fine print, and always take some time and do your diligence before trouble happens. All prices assume coverage for an iPhone 4.