Not available -- Sprint ( S) doesn't offer iPhone insurance and refers customers to Apple. Coverage for other high-end smartphones, like the Samsung Galaxy Nexus, is $11 per month with a $150 deductible, bringing "Total Equipment Protection" fees for two years to $414. Read the fine print at Sprint's Web site. Not offered -- T-Mobile, owned by Deutsche Telekom ( DT), doesn't offer the iPhone. But its top-of-the-line smartphone coverage is $7.99 per month with up to a $130 deductible, bringing the comparable two-year cost to $321.76. Read the fine print at T-Mobile's Web site. Check yourself -- Asurion, which is the default insurer for the four major phone carriers, doesn't sell coverage directly to consumers. However, at its site gottahavemymobile.com, it tells you exactly how much you'll pay based on carrier and type of phone at six, 12 and 18 months. This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.