Absolutely! Apple provides customers with how-to and troubleshooting information for hardware and software questions.
Support : http://www.apple.com/support/iphone/
User Guide: http://support.apple.com/manuals/#iphone
Technical Specifications: http://support.apple.com/specs/#iphone
User discussion forum : https://discussions.apple.com/community/iphone
For additional assistance contact Apple Support.
Follow these directions: Visual Voicemail Update
Locate the upgrade link on the support page . Follow the manufacturer's instructions to download and install upgrade.
Calls are considered local when made from SRT's service area or extended network (link to map) to any exchange listed.
It is the process of making and receiving calls outside your local coverage area. Roaming usually incurs extra charges. Additional Roaming Information.