According to AA with wayback webpage tracker Samsung's own page only changed to that yesterday 9th. With the additional emphasis on 'strongly advise' added twice from previously just saying 'advise'.Thats a good point. But then then they would have to have something in the fall to release too. This way people buy their phone instead of the competitors.
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I got the exact email from Samsung and T-Mobile. They have been saying this for a few days now.
Whilst carrier messages may have advised users to return devices ASAP sooner - it's only since 9th that it changed on Samsung's own page from merely 'advising customers to return' to telling them to actually 'power down and return their device now ' .. that's a change of emphasis and urgency to the matter.