What further info do you recall from your California trip? Once you have subscribed to Easy Roam it should work as soon as you connect to a partner network. Sometimes you need to restart your phone on arrival.
Make sure you have international data and international voice included in your plan. You can check this in My TELUS.
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Make sure your phone has roaming turned on. It roaming is not turned on, then it will only work with Telus. Text ROAM to 7626 to ensure you are enrolled. If you have further questions, you should state which type of phone you have.