Web.de Freephone minimum loading for portable radio discussions??

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web.de offers portable radio discussions for 22,9 to cent.

my loading amounts to at present still 35 cent.
that should actually for one minute to tests to be sufficient,
however I receive one announce that my assets are not sufficient.
in festnetz I can telephone.

with web.de I did not find information,
also no support email address.
the 0190er number (01212 for 1,86 euro) I become
do not call on principle.

does someone know from you which??

in advance thank you

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Apparent min the assets must always be present for 2 discussion minutes.