On Android, you can report spam text messages from the Messages app, by touching and holding the conversation you want to report. Tap Block, then Report spam and then OK. On iPhone, the Report Junk button appears under messages from unsaved numbers. Tap it, then tap Delete and Report Junk. In UK and the US, you can report spam text messages by forwarding them to number 7726. If the spam comes in the name of an authority or a company, contact them with the message. You should also report the scam to the relevant authorities in your country.