So by apple policy if my iphone is broken can yall replace it with another iphone

It will depend on whether or not, you are expecting to get a replacement phone for free. Since you didn't provide any information on what you are asking, it will be difficult to provide you with an answer.

For example, if this phone is within its one year warranty and after an Apple technician examines it and determines it has a manufacturing defect, you may get an option to get a replacement. Otherwise a replacement would be at your cost.

That depends. Do you have Apple Care+? Regular Apple Care will not cover damage. Apple Care + will cover damage to your device. Check your coverage.

Broken how?