Solved! Go to Solution.
You say both phones are identical (same model?) so there shouldn't be an issue with SIM card size.
You are lacking details on what the problem is.
1) Do you know that the other phone works with any SIM card?
2) Is the other phone a TELUS phone?
3) When you say it doesn't work what do you mean? It can't get signal? It doesn't power up? You get an error? What?