Nasserdine Menni was in a "very upset condition" when he made the call, the jury was told.
Taimour Abdulwahab died in the blast in the Swedish capital on December 11, 2010.
Menni is charged with conspiring with Abdulwahab to further terrorist aims. It is alleged he conspired with Abdulwahab and others from addresses in Glasgow, Luton, Bedford, Syria, Iraq and Sweden. He denies all the charges.