I have read the DonManfred and LucaMs links, before posting the question. There is written That, provided that it is not a GooglePlay App, I can send and receive Sms. An now I found another test App that sends SMS, on same device. Therefore perhaps I can understand why the first one crashes. BUT, to simplify my life, the first App, if used for receiving, now says "Cannot start a receiver in debug mode" --- of course if run in Release Mode. Resuming, while for Sending maybe I can resolve, receiving seems now more difficult.