IOS – Are there any DIY remedies for a iPhone 4 home button that doesn’t always register

Take it to the Apple Store. Tell them exactly what is going on and that it's a real problem for you. Even if they can't recreate the problem there in store, they will replace the device. I had a similar issue with my iPad. I took it in and explained everything and even though they couldn't replicate it they replaced it.

If anything, they will help you get a resolution. I've never gone into an Apple store with a problem only to have them tell me "Sorry, nothing we can do."

I can feel the edges of the button on both my black iPhone 4 even when the button isn't depressed - so your description alone doesn't necessarily mean there is a defect (but you should be very happy with your new purchase and it could very well be a defect).

If you can go to any retail (cell carrier or Apple) store and compare your device to others (or have friends with any iPhone 4 to compare) it will be very easy for anyone to agree if your phone's button is different than the rest. No matter where you bought the phone - Apple will exchange it if the hardware is defective at no cost.

You also can return a new phone to the seller within 30 days - but getting it in the hands of an Apple tech will be the fastest way to know it's covered or a defect - or if it's just a normal variation of the manufacturing process.