People don't choose Android simply because "it's cheaper." Usually it isn't cheaper. Galaxy S3 is still $650+ off contract. Sure the Nexus is cheap, but Google has barely sold 400,000 units of Nexus 4. (Probably due to supply issues.) The Nexus lineup is cheap because Google is subsidizing the products themselves (breaking even on devices) to increase use of it's services. It's an investment on their part to learn more about you and sell more effective ads to advertisers.
But... let me get into this economic argument with you.
For the sake of this argument... let's say Apple wants to cannibalize the sales of Galaxy S3. We'll use your price suggestion of $350 unlocked for iPhone.
iPhone 5 costs $199 in parts. (I am not even going to count the costs of R&D, assembly, packaging, shipping, advertising, retail...etc.)
SOURCE:
https://www.macrumors.com/2012/09/19/iphone-5-component-costs-estimated-to-begin-at-199/
iPhone 5 CURRENTLY COSTS $650 unlocked. (16GB Model)
Let's guess that iPhone 5 will sell 50 million units and Samsung sells 40 million Galaxy S3's. (Random numbers loosly based on:
http://nvonews.com/2013/01/03/samsu...nokia-lumia-920-iphone-5-best-phones-of-2012/ )
At $650 subtract $199 in parts. So $449 is profit.
$449 multiplied by 50 million iPhones is $22,450,000,000!
$22.5 BILLION in profit for just iPhone 5.
Now let's take your suggested $350 price point and subtract $199 in parts.
That is $149 in profit per iPhone.
Now let's say... at $350, Apple will sell more iPhones and cannibalize the most popular Android phone Galaxy S3. Let's say Apple steals 30 million sales from Samsung because they are "soooo cheap now."
So Apple sells 80 million iPhone 5's at a $149 profit.
That's $11,920,000,000 in profit.
How is that better for Apple?
Also... this whole thing banks on the assumption that Apple's competition WON'T lower their price too... which they would have to in order to compete... thus causing Apple not to cannibalize any product and not get the increased sales figures they were trying to get.
Also... many people don't choose Android for price anyway. Many are Google users. Many like open source. Many like the customization options.