How do i change network connection in SHARP GX20?my mobile has gave up the cause and i have an old Sharp GX20

but have changed my supplier can i change my phone network settings to my present supplier? without spending.......How do i change network connection in SHARP GX20?my mobile has gave up the cause and i have an old Sharp GX20
Contact a local second hand mobile dealer. They all unlock phones for next-to-nothing. Then phone your new network %26amp; ask them to send you the settings for MMS etc.