Melbourne tunnel gets mobile coverage

Melbourne train passengers will no longer have an excuse to get someone off the phone.

Telstra and Optus have joined with the state government to offer full mobile coverage through Melbourne's city loop tunnel.

Premier Denis Napthine said the black spot cost Melbourne millions of dollars in lost productivity.

"It's the 21st century, we need full connectivity," Dr Napthine told reporters on Monday.

He said the cost was commercial-in-confidence, but 3G services would be delivered by the end of the year.