My phone is stuck with the same issue. A friend of mine works for an iPhone support center so I asked her about it. She had a customer with the same issue and had to refer him to Apple. She gave him a courtesy call later in the day and he told her Apple said he would have to replace his phone. I've been trying to figure out a work aroud to this since iOS 7 was released and I still have yet to come up with anything. Even doing a full restore and reactivating the phone didn't work. Let me know if you figure anything out. I will do the same for you. But right now the situation looks bleak unless Apple fixes this in a future update somehow.