Suddenly no calls or texts are going through or coming in on iPhone 4. Email works and voicemails show up, but the phone doesn't ring. I have done a soft reset numerous times. Occasionally an iMessage will get through, but not always. I didn't drop the phone or anything. I can't call into *228 to reset that way because I can't call out. I've tried checking airplane mode and I am not roaming. Is there a solution?