Why is 123 on my metro pcs bill?

The charge of $123 on your Metro PCS bill could be due to various factors, such as your monthly plan cost, additional fees for services or features, taxes, or overage charges if you exceeded data limits. It's best to review your bill details for a breakdown of charges. If you're unsure or believe there's an error, contacting Metro PCS customer service for clarification would be a good step.