Short answer: clean up spam contacts on Android by separating obvious junk entries from real people before you merge or deduplicate the address book. Spam cleanup is usually a filtering job first, not a merge job.
The clutter can come from promotional imports, broken sync, old service numbers, or random one-off entries that never belonged in the main contacts list. Leaving them there makes duplicate cleanup slower and less trustworthy.
What counts as spam contact clutter
Unknown promotional or scam-like names with no real relationship value.
Old service entries saved once and never used again.
Garbage records created during imports, sync conflicts, or app migrations.
How to clean it up without harming real contacts
Clear obvious junk first before attempting a full merge pass.
Treat uncertain business numbers or delivery contacts as review candidates, not instant deletions.
Use duplicate cleanup only after the junk layer is reduced.
Why this helps the rest of contact organization
A cleaner address book makes it easier to notice true duplicates, overlapping account sources, and people who still need merging. Spam removal lowers the noise floor before the more important contact decisions begin.
If you want the feature route next, open duplicate contacts. If you need a follow-up cleanup step, continue to How to Remove Empty Contacts on Android.
Spam-contact cleanup works best when junk records are removed before real duplicate people are reviewed.