Not to be a dick but if you're from Shropshire I doubt you'll have too much to worry about when it comes to gangs. I know the Telford massive can be intimidating but they're too thick to work out how to use a phone let alone steal one from you.
Anyways, sounds as though the area matey is living in IS an area where gangs are based. So he HAS to be there everyday, no way of avoiding it.
I guess carry as little on you as possible (maybe a tenner to give to them - Some wont stop until they have something of yours. Better for it to be a tenner than your teeths) and as JD says just act as if they're normal people. Dont be scared of them and the most important thing is dont bring attention to yourself. If you have an ipod, swap out the white earphones for bog standard black ones, and keep it hidden.