You may personally block the number through your device. The steps will be different depending on your device. Please refer to the steps below:
iPhone
1. Open the Messages app.
2. Select on the message from the spammer.
3. Choose details on the top right hand corner.
4. There will be phone icon and a letter “i” across from the number. Tap on the “i” icon.
5. Scroll down to the bottom of the page and then select on Block this Caller.
Android
1. Click and hold the text message from the sender.
2. After a short delay, you will be given a prompt to either delete the message or add to spam.
3. Select “Add to Spam” and confirm the prompt to blacklist the number of the sender.
Huawei
1. Open the Messages app and then select Menu and choose Settings.
2. Then choose Spam Settings / Harassment Filter.
3. Now you can go to Add Numbers to Spam and add the number of the person that you need to block.
HTC
1. Open the
Messages app, press and hold a contact (or phone number).
2. Select Block contact.
3. To block multiple contacts, go to
Block contacts. Select the contacts, and select
Block.
Dell
1. From the Home screen, open the Applications icon.
2. Select Messaging.
3. Select the message that you want to delete.
4. Select Menu.
5. Select Delete thread.
6. Confirm by choosing Delete.
7. To include locked messages, tap to select include locked messages.
8. Select Yes.
LG
1. From the home screen, open Messaging.
2. Select Menu > Spam manager.
3. Select Spam settings.
4. Select Spam numbers.
5. Click the trash can icon.
6. Select the numbers you wish to unblock.
7. Choose DELETE, then confirm with YES.
Xiaomi
1. Open the Messaging app.
2. Tap and hold the message from the contact/number that you want to block.
3. Select Add to block list.
4. Confirm by clicking on OK once prompt.