[ Version ( since = "1.0" ) ]
public bool cancel_sync (Cancellable? cancellable = null) throws Error
Synchronously cancels an ongoing USSD session, either mobile or network initiated.
The calling thread is blocked until a reply is received. See cancel for the asynchronous version of this method.
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| cancellable |
A Cancellable or null. |
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true if the session was successfully cancelled, false if throws is set. |