Because, your phone is either locked, broken or something wrong with its IMEI (to check put in code *#06#) or you just don't have any credit.
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I'm not sure what you mean by that. Do you mean theer sending you a text message if so try sending Stop to the number that should stop them sending messages to you.
just tell everyone on your contacts too stop sending you group messages if you want to...
You can stop someone by sending message only by blocking that person from your Facebook. Messages will only be stopped when you block the person who is stalking.
you text back to the number saying quit or stop and then they legally have to stop.
Whilst the message is sending, tap "Edit" next to the send bar and select the message that you're supposed to be sending. After selecting the message, click delete. That will stop the message from being sent. Keep in mind that this is supposed to be a quick process so you have to be quick to delete the message before it's sent,