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Might be your APN and MMS settings that are incorrect. Check here http://mobility.telus.com/en/QC/Non-TELUS-Devices/how-to-002257.shtml or reach Telus at *611, 1-866-558-2273 or even better on Twitter @TELUSsupport for troubleshooting. Make sure your data is enabled, you must be able to access data without wifi
If you have a non-Telus unlocked phone, you'll need to manually set your APN and MMS settings. Follow the instructions here http://mobility.telus.com/en/QC/Non-TELUS-Devices/how-to-002257.shtml
You can also reach Telus for technical support on Twitter @TELUSsupport to troubleshoot the issue