setting deployment target for iPhone app

i tested my application by setting deployment target to 3.0 on iPhone device with 4.3.2 version and my iPhone app was running smoothly so my question is that do i still need to test my app on iPh开发者_运维知识库one device with lower version like 3.0 before submitting it to app store. Thanks in advance for your any help.

Yes: if you call any API that was introduced after iOS 3.0, it will crash. The only way to be sure is to test on an actual 3.0 device.

Yes you definitely should test your application on a device with iOS3 to ensure that everything is working.

Setting the deployment target to iOS3 only ensure linking. Do not forget that iOS3 has not only different APIs, but also differents behaviors for same components, even with same code.

And behaviors can even differs from Simulator to Device!