I have had my Fido mobile number for 2 years and am still receiving multiple bill collector calls intended for the previous owner of the number. I use an Android call blocker app (Extreme Call Blocker) and blacklist the numbers. I hear the app hang up a blacklisted number part way through the first ring and I check that nothing is ever sent to voice mail. Each month my bill is showing these "IRM" calls as 1:00 minute in length. How can this be? Fido customer service told me that only incoming calls that are answered or sent to voicemail will show up on my bill.
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