Verizon is still giving out misinformation on this. A support representative confirmed to me in writing today that "As of February 1, 2015, Verizon Wireless will not send an identifier to third parties." However, it's still being sent, and a higher-up representative said later that a third-party identifier will currently <i>always</i> be sent, and there's no known timeframe for availability of an opt-out program.