The virus gets into a host cell by in the following manner:
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The virus attaches itself to the host cell receptors present on its surface by means of specific proteins present on its surface called Spikes.
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After the attachment, the cell wall of the host cell is digested by lysozyme enzyme released from the tail of the virus particle (phage). Lysozyme drills a hole in the mucopeptide layer of the cell wall.
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The contraction of the tail sheath pushes the core tube through the cell wall of the host cell and the DNA gets injected into the host cell.
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The capsid or protein coat remain outside the host cell while only the DNA molecule is injected into the cell.
