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A comment on US says it can prove Huawei has backdoor access to mobile-phone networks. Parent comment

Re:US says it can prove Huawei has backdoor access to mobile... by smitop on Wednesday February 12, 2020 @06:26PM (#22313893)
On a related note, if you start an SMS with "!", then the leading exclamation point will be stripped, and a delivery confirmation SMS will automatically be sent (not sure if it's from the mobile network or the receiving phone). This makes it possible to send zero-character SMSes.
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Re:US says it can prove Huawei has backdoor access to mobile... by franga2000 on Thursday February 13, 2020 @07:06AM (#22317081)
Huh, just tried it and the ! got through. Could be network- or encoding-specific?
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Re:US says it can prove Huawei has backdoor access to mobile... by dustfinger on Thursday February 13, 2020 @05:51AM (#22316738)
That is interesting. I will try that out later today.
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Re:US says it can prove Huawei has backdoor access to mobile... by alexilliamson on Wednesday February 12, 2020 @06:55PM (#22314079)
Ha! I respond to texts with a single "?" a lot of times, so it's funny to know that they're getting a blank text
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