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Fossify Phone vs Phone (cz.mts): catalog facts
Fossify Phone	Phone (cz.mts)
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0 license.
Android	Android
No ads or tracking libraries Number blocking and multi-SIM support	Includes a dialer and contact management Can allow calls only from saved contacts
Android only A dialer only; contacts and messages are separate Fossify apps	Android 9 or later Optional spam checking sends unknown caller numbers to third-party databases
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.