Tens of thousands of marriage equality supporters kicked off a text message and doorknocking campaign this weekend encouraging people to vote "yes" in the same-sex marriage postal survey.

On Saturday, people started receiving text messages on their mobile phones from YesEquality, which stated: "The Marriage Equality Survey forms have arrived! Help make history and vote YES for a fairer Australia. VoteYes.org.au."

But not everyone – regardless of their view on same-sex marriage – was happy to receive an SMS, with some expressing concern about how their phone numbers were obtained.