Why would anyone argue against adding a FREE new feature, that cannot hurt, but can only help save lives?
This feature ALREADY is built into every iPhone ever made, the impact on battery life should be minimal, as there is no transmission.
No it's not built into the phone. There's a tiny chip onboard that's an FM receiver. Period. You still need to have an antenna hooked up to it and have logic run to the chip to control the frequency, etc. Not to mention other signal processing you may want to add.
You people OBVIOUSLY don't understand wireless needs antennas. Did you ever notice that your car has a big, honkin' antenna on the front of it? It's about 3 feet long? Maybe your car's is shorter, but you may notice the wire wraps around the core of the antenna. That's because an FM antenna MUST be a certain size to be effective.
FM radio operates between 2.78 to 3.41 meters (that's the size of the radio wave). Ideally, the antenna would be approximately 3 meters long. However you can half or quarter that antenna to approximately 75 cm (quarter). That's why most FM antennas are that long or are telescopic.
In comparison, cellular operates at much higher frequencies. This means the antenna can be (and must be) shorter. For instance, if you are running cellular around 1 Ghz or less, the antenna length becomes 7.5-9.0 cm in length. This can easily fit inside of the enclosure of a cell phone.
So your only hope is an external antenna. At that point, you need to connect it to a port (like say a headphone jack) and have enough UNSHIELDED wire to for an antenna. Again, you need about 75 cm. This causes issues with radio transmission, shielding from external electrical interference during regular listening, etc.
So... while there's a tiny chip in the phone, it by no means contains all the parts to have an FM radio. Apple would need to reengineer much of the phone and included headphones.
To put out the most obvious question... Why? Why is it so important to have FM when you ALREADY HAVE CELLULAR? You can accomplish the same types of things. Cellular text alerts and warnings for instance. The only real benefit to FM is that you can have a larger antenna that carries for a longer distance. But still, if an antenna blows over, it blows over. If the FM antenna does, you lose 100% of coverage. Cellular by its very nature, is mesh. That means even if one tower is damaged, another could still work. It's more resilient for that reason.
I just don't see the point. Go out and buy yourself a $5 FM radio receiver if you are facing a hurricane. Or better yet, have the government buy everyone one... oh wait, that's right. The government doesn't want to be the government any more, only outsource it to the highest bidder...