Sprint PCS has listed the SMS price structure on their web page. It doesn't give any grandfathering information but here is the pricing directly off the web site... (click on individual links for further information) ..........

Unlimited SMS Text Messaging for Sprint PCS Vision Packs $5.00
Upgrade the 100 SMS Text Messages included in your Sprint PCS Vision Pack to unlimited. (Requires a Sprint PCS Vision Pack and an SMS-enabled Sprint PCS Vision Phone.)

Unlimited SMS Text Messaging $10.00
Send and receive Unlimited SMS Text Messages. (Requires an SMS-enabled Sprint PCS Phone.)

100 SMS Text Messages $5.00
Send and receive 100 SMS Text Messages. (Requires an SMS-enabled Sprint PCS Phone.)


__________________
Sprint PCS Free & Clear America (affiliate) Plan - 2000 Anytime Minutes, 150 Roaming Minutes, Unlimited 7pm N&W & PCS to PCS Minutes w/Vision for 3 phones.