Welcome to the forums!

First, please tell us why you don't like shooting with a tripod. Macro work or not, if your subject is 100% stationary, there should be little reason not to use a tripod. Perhaps you'd be better off with a new tripod instead of a new lens.

Second, why can't you use a 100mm lens to shoot larger products like phones? It should be fine for what you're doing, unless you're in such a tiny room that you can't back up any further. That said, I also can't imagine selling your 18-55 and committing to just a 100.