1 Check your coverage area to make sure that you're in an area with cellular network coverage. 2  Restart your iPhone or iPad. 3  Check for a Carrier Settings Update. 4  Take out the SIM card and then put it back in. 5  If the SIM card is damaged, or doesn't fit in the SIM tray, contact your carrier. Check for a Carrier Settings Update. 2  Take out the SIM card and then put it back in. 3  If the SIM card is damaged, or doesn't fit in the SIM tray, contact your carrier.
Tinnitus is the medical term for hearing noises in your ears when there is no outside source of the sounds. Tinnitus is often called ringing in the ears, but it may also sound like blowing, roaring, buzzing, hissing, humming, whistling, or sizzling. The noises you hear can be soft or loud. You may even think you are hearing air escaping, water running, the inside of a seashell, or musical notes.
People with tinnitus complain of noise in one or both ears, or a different sound in each ear. In either case, the noise can become louder or softer at different times of the day. And the louder the tinnitus, the more tense and irritable you become. Infection or injury are common causes of the problem. But it can also be a symptom of Meniereâs syndrome, a hearing disorder caused by fluid retention in the ear, which in turn can be caused by allergies. And tinnitus can be a direct result of allergy-triggered inflammation of tiny blood vessels inside the ear.