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Spam Blocker app for unwanted phone and sms
(lemmy.ml)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
The spammers, afaik, are using voip numbers. Regardless or where the spammer lives they can get a number for any area code.