Adding SMS texting functionality requires things beyond the scope of the server at the moment. However, email is already set up and functioning, so notifications via email would be a simple addition. Since I know some would rather get an SMS instead of a text, there are solutions. Many cell providers have email addresses for email-to-SMS functionality, and this type of notification would work if you can provide your phone's SMS email.
I know for Verizon, a cell number is simply your number plus area code @vtext.com (in the US). So your phones SMS email would be something like 5552346789@vtext.com without the leading 1. I'm not familiar with the other carriers however nor am I familiar with numbers outside the US, so perhaps others can add some additional details.
The questions are:
- Is email notification sufficient?
- What do you want to be notified about? Attacks? Game mail? Logins?
- How much information do you want in a notification?
- Should it be only available for players with donator days? (To eliminate notifying players no longer playing.)