Long story short, I just picked up 3 churches for my SMS text broadcasting service.
Church 1: 3 keywords - one keyword for the main congregation (service announcements) and two keywords for their ministries.
Church 2: 2 keywords - one keyword for the main congregation (service announcements) and one keyword for their youth group.
Church 3: 1 keyword - main congregation (service announcements).
Key points to address when speaking with pastors and ministers:
1) This does not replace their neighborhood outreach marketing campaigns.
2) Text Broadcasting reduces current cost expenditures (live outbound reminder calls, printed/mailed flyers or postcards) and has a huge open rate.
3) Can be delivered exactly when you want rather than dealing with the postal service or outbound calls going to voicemail.
4) They can create different "groups" to send texts to specific people rather than the entire congregation.
The cool part is that youth ministers love this stuff and talk to other youth ministers. Pure authentic referral marketing.