Testing on multiple IOS device

I have done an IOS certificate, Provisional certificate on one IOS device(Iphone).
I started testing. Now I want to do the same testing on another IOS device(Iphone).

So do I need to do all the certification again ? or
Is there any possible option to add a device?

Hello @sunuthomas,
When adding a provisioning profile the certificate contains the listed devices in your Apple developer account. if you add a device you will need to create a new Provisioning Profile and update it in your TestProject account