Are airliners in contact with their airlines, via say satelite phone? Would the pilot be able to verify with Ryanair HQ whether they know about the bomb threat

Are airliners in contact with their airlines, via say satelite phone? Would the pilot be able to verify with Ryanair HQ whether they know about the bomb threat they are being fed from ATC? Of course when the recomendation is accompanied by a fighter jet one doesn't have a choice regardless, but I'm still curious whether they are at ATC's mercy for information.