For most of the body parts there are existing models from other research groups which you can adapt to your application. Unfortunately, no-one have created and shared such a model of the hand. The model repository does have a hand model but without muscles. But that is probably not what you need. Creating a new model with muscles from scratch is a huge job. Probably worth a few phd projects.
I am also a little unsure if a multi-body model is really what you need to study the effect of vibrations from a mobile phone. Why did you want to use AnyBody ( or any other multi-body software) for your research question?