I have not found how calls made after 6 pm are being charged. In particular, long-distance calls within the province and Canada-wide call made on MTS wireless network. The rule I found seems too vague to me in terms of LD/Canada-wide calls.
Hi chemist, CoryB is 100% correct, the specifics for calling, charges and times depend entirely on your plan and which service, home phone or cell phone. I highly suggest reaching out to our sales group either by calling 204-225-5687 or by chatting in at www.mts.ca/contactus. They can answer your questions more directly and hopefully get you setup with something that works for your needs.