Not really since the iPhone has been increasing the price every generation, my 4S costed me 599€ my 5 679€ my 6 789€ and so on...
In the United States, prices were fairly constant from the iPhone 3G through the iPhone 6.
3G: $199
4S: $199
5: $199
5S: $199
6: $199
6+: $299
6S: $649.
Of course, part of that is that the carrier used to subsidize part of the price of the phone, in exchange for locking customer into a two year commitment. The subsidy part dropped disappeared in 2015.
https://www.statista.com/chart/11067/how-the-iphones-price-developed/