phone says invalid card. How can that be?

[Rosphone]

Why does my phone say invalid card.  I have been using it for 4 months.  How does the card become invalid?  Please help.

[tikibar1 · Accepted solution]

If you're referring to the SIM card, have you tried reseating it?  In other words, turn off the phone, remove the SIM card (be careful not to touch the gold contacts), wait a few minutes, then reinsert the SIM card, turn the phone back on, and allow it a few minutes to establish a fresh network connection.

SIM cards can sometimes go bad.  If reseating doesn't help, you might try a new SIM card ... they're free at Corporate Verizon stores or by calling Customer Service.