Hi there and welcome
Can you please hold the power button on the phone until you see a menu and choose power off.
Then power it on again and tell me if it is now functioning correctly please
Which model Samsung Phone do you have?
that is the model, Samsung S150G
Can you remove the battery and sim card from the phone.
Then wipe the sim card on your sleeve or a dry cloth, put it back in, put the battery in and tell me if it then functions correctly.
If you would like any additional information or assistance, please do not hesitate to let me know.
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