Blocking numbers is easy to do. That said, the exact instructions may vary depending on the manufacturer, model, and operating system of your mobile device. Also, keep in mind that the same operation may try to text you from a different number.
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On an iPhone, open the text of the number you want to block and tap the sender’s number. Click the info icon (i). Under the Details screen, click the phone number, choose Block this caller and Block contact.
On an Android, open your phone app and tap the three-dot icon in the top right corner and choose Settings. Tap Block numbers. You will find several options including unknown callers, recent calls or from your contact list. Choose or manually enter a number you want to block.
Be a storyteller
Reporting a robotext or spam message to your mobile operator is an important step in the fight against robotexts and spam messages. Copy and forward the original text free of charge to 7726 (SPAM). You can use this method if you are a Verizon, AT&T, T-Mobile, Sprint, or Bell subscriber.
File a formal complaint
According to the Federal Trade Commission (FTC), it is illegal to send unsolicited commercial electronic messages to wireless devices without your consent. This act includes texting to your cell phone, and it is furthermore illegal to send unwanted text messages from an autodialer.