I'd like to have the ability to conrol 4 linear servos from an iphone. Nothing complicated, just 4 buttons in an app that control the servos. (maybe I could customize the design of the app, but not critical).
I found a standard wifi receiver from a hobby shop, but that looks very limited as far as the app control is concerned.
Is this something that arduino can do? IF so, can someone reccomend the needed components for the project?
I've used an ESP8266 to control the motors on a small vehicle from an Android app using the WebSocket protocol (over a WiFi connection). You could use HTTP as well.
Take a look at the WeMos D1 mini or NodeMCU, or similar.
I think you should look carefully at the iPhone end first and see what apps are appropriate for the job. Bluetooth might be easier but there isn't that much in it. If you go the WiFi route, you will probably be better of using a Node MCU, as mentioned in reply#1, rather than an actual Arduino.