A User Calls The Help Desk To Report About Their Smartphone Not Being Able To Make Any Phone Calls. The User Admits That The Smartphone Can Still Send/Receive Email; Browse All Websites; And Utilize All Internet-capable Applications. Which Of The Following Issues Is Most Likely Affecting The Smartphone?

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A User Calls The Help Desk To Report About Their Smartphone Not Being Able To Make Any Phone Calls. The User Admits That The Smartphone Can Still Send/Receive Email; Browse All Websites; And Utilize All Internet-capable Applications. Which Of The Following Issues Is Most Likely Affecting The Smartphone?