Most providers want a text since they will know you're more serious and not just looking for free chatting. But as @Decatur Guy said I as well like to initiate contact on messenger so I can get a quick feel for the provider and see what their rate is and if they are a good fit for me. Then I can move it onto text. I remember one provider I hit up and they responded with very incoherent replies back. I was so glad in that case to not have texted. Much easier to say no and move on through messenger than text. You never know if a provider will get pissed off and possibly spam bomb your number. Plus I like to have the provider check out my client page for all my stats and info and save them from asking for all that info.