My friend had a problem with her phone. Somehow it was acting weird, I knew someone was hacking her. I tried to help her by doing a PIN Lock and a factory reset of her android phone (version 6.0), but the day after, she received a SMS text message from her ISP saying that she was trying to access a feature that does not exist. How is it that the hacker is still able to get through her?
closed as unclear what you're asking by Steffen Ullrich, André Borie, techraf, Michael, John Deters Oct 3 '16 at 4:27
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The problem your friend experiences does not look like "SIM card cloning". Two signs which may indicate that someone has cloned your SIM card are the following:
You see in your billing statement the calls/texts made from your phone which you did not make (however if you have a smartphone, this may also indicate that there is malware app running there, which generates those calls).
When your friends call you, your phone doesn't ring although they hear the phone is ringing. And when they text you, you do not receive texts (but if you turn your phone into airline mode and turn it back, you will receive the text sent after that).
If your SIM is cloned, nothing you could do with your phone would help; resetting the phone is completely useless. You should go to your operator and get a new SIM.
Now, regarding your issues:
How I knew it was a hacker? unable to receive phone calls,
May be a network problem. However if the calls get through and someone else picks up the phone, may be the result of SIM cloning (but make sure someone or something did not enable call forwarding service)
sms text message slow, screen changing on its own
This has nothing with SIM cloning.
not being able to receive text message from some of her friends
If this means "I cannot receive texts from anyone from 2-3pm, even though I see in my billing the texts were received", this may be SIM cloning.
sometimes receive a weird text WAP_push, etc
This looks more like malware or incompatibility between the handset and cell operator.