text msg from 5803

Received this text stating it is from Telus. Have never received a text from them before. Is it legit?

We value your opinion of our world-leading network. Please rate your mobile experience with TELUS in the last 24 hours on a scale of 1-5:

5-Excellent
4-Good
3-Fair
2-Poor
1-Very Poor

Reply with only the number corresponding to your choice.
Responses will be used by TELUS to improve network experience to better serve you.