Unless this is a national security case, the federal government must get authorization from a court
to authorize a wiretap on a personal cell phone. This is required by the US Constitution. If the government taps a phone listens to a private conversation without prior authorization then it may be possible to "suppress" the evidence they gained through this tap.
Now there are various ways to tap a cell phone, but the most common is to simply have the service provider provide the "tap". This can happen with the government presenting the subpoena from the court.
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