The National Organization for Marriage (NOM) is calling on followers to cancel T-Mobile service over the company's support of gay marriage in Washington state.

Last month, T-Mobile announced it would back Referendum 74, the Washington ballot measure which if approved would uphold a gay marriage law enacted by lawmakers, and gave $25,000 to Washington United for Marriage, the campaign to approve the measure.

“Our support of this issue is a reflection of our culture, how we do business, and our belief in the fair and equitable treatment of all employees,” Jim Alling, interim CEO of T-Mobile USA, said in a statement.

NOM, the nation's most vociferous opponent of gay marriage, launched a petition on in opposition to T-Mobile's stance.

“Join us in signing this petition to let T-Mobile know that not everyone supports their efforts as a public telecom company to redefine marriage and tell our society that moms and dads are interchangeable,” the petition states. “After signing this petition, for those of you who utilize T-Mobile services, consider canceling your contract and transferring to a different provider.”

NOM has previously targeted Starbucks and General Mills for their support of marriage equality.