Zwar nicht AT&T, aber damit Du siehst, daß es dort nicht unüblich ist, für eingehende Anrufe zu zahlen. Deshalb werben die mit "kostenlos"

Do Incoming Calls Use Minutes?
https://www.techwalla.com/articles/do-incoming-calls-use-minutes



Unabhängig davon, überlegt Euch was Ihr mit Euren Telefonen an der Grenze macht, die anlaßlose Durchsuchung von Telefonen und Computern findet immernoch statt, inklusive des "Erbittens" von Zugangsdaten.

https://www.eff.org/de/deeplinks/2018/07/eff-files-amicus-brief-seventh-circuit-supporting-warrant-border-searches

Die Überschriften aus dem im Artikel verlinkten EFF-ACLU Wanjiku amicus brief 7th Cir. sagen schon alles

Border Searches of Electronic Devices Are Increasing Rapidly and Affect Large Numbers of Travelers.

Warrantless, Suspicionless Searches of Electronic Devices at the Border Violate the Fourth Amendment.

The Fourth Amendment Requires a Warrant to Search the Contents of an Electronic Device at the Border. The Supreme Court’s Analysis in Riley v. California Dictates That a Warrant Is Required.

Travelers Have Extraordinary Privacy Interests in the Digital Data Their Electronic Devices Contain.

The Government’s Interests Must Be Assessed in Light of the Narrow Purposes of the Border Search Exception. Under the Supreme Court’s Pre - Riley Border Cases, Warrantless Searches of Electronic Devices are Unreasonable.

The Warrant Requirement Should Apply to Border Device Searches Irrespective of Search Method Used