The iPhone’s Visual Voicemail can be a very helpful feature, especially if you rely on your phone for scheduling appointments or contacting clients. However, leaving your voicemail activated while traveling abroad will result in unwanted data roaming charges. The steps below will work for your iPhone if it is connected to AT&T or most other major U.S. carriers. If you are unable to disable voicemail, contact the customer service branch of your particular carrier. Tips Writer Bio