State v. Jermichael James Carroll, 2008 WI App 161, affirmed, other grounds, 2010 WI 8
For Carroll: Michael K. Gould, SPD, Milwaukee Appellate
Issue/Holding: The police may, incident to lawful arrest for drug use, answer an incoming call on the arrestee’s cell phone, ¶¶27-29.
Note that supreme court affirmed on different grounds, namely the exigent-circumstances need to preserve evidence that would otherwise be lost if the call weren’t answered. The rationale assumes, of course, lawful seizure of the cell phone.