Is phylum for porifera warm or cold blooded?

Neither, they don't have blood. Instead, Porifera or sponges use specialized cells to sweep water through their bodies, carrying food particles in and waste out. This serves as both their circulation and their movement (remember, all animals move.) Endotherms (warm-blooded organisms) regulate their body temperature by altering metabolism. Ectotherms (cold-blooded organisms) regulate their body temperature by behavior such as warming on a hot rock, or seeking shade to cool off. Sponges don't regulate their body temperature at all, therefore they can't be either.