Re: what kind of phone should i use for the raspberry pi and phone project? if no specific phone specs for the phone?
I assume you are referring to the IoT projects from the IoT Academic Program Projects | ThingWorx . Is this right? If that is so, you can use any phone that has an Android OS or Windows OS (we are working on adding an iOS OS also for iPhones).
If you are referring to an application from the DEV-ZONE I am not the right person to answer this but I might direct you to somebody who can answer this.