Thank you for your inputs.
This is my first " smartphone", I am more at home sending sms text messages with my old Nokia.
About this SD card, are you talking about the SIM Card in the phone ?
I don't know about an SD card, is that the same kind of card that I have in my camera ?
If I've I got an SD, where is it and how do I access it, and how do I move the App onto the card ?
You say this may be an attack. The curious thing about this is that I got a payment into my wallet from an unidentified source, just a few hours before my App crashed. - Co-incidence ??