Contacting parents via text messages

I have been texting parents ( those with mobile phones listed in our school records ) and pointing out the time remaining to complete the work and also issues relating to absent folios. I understand that some parents may not want me to contact them in this way. If this is the case please leave a message at the school office - tel number 01482 881531. I will then remove the contact from the list. I have never intended to cause undue concern or worry but simply to keep as many channels of communication open as possible. It has been mentioned to me that these mobile contacts are for emergency only. If anyone objects to my texting them, I can email instead if I have your email address. I find this quicker than using standard mail or indeed using the telephone.