  Cell-free wireless communication is envisioned as one of the most promising
network architectures, which can achieve stable and uniform communication
performance while improving the system energy and spectrum efficiency. The
deployment of cell-free networks is envisioned to be a longterm evolutionary
process, in which cell-free access points (APs) will be gradually introduced
into the communication network and collaborate with the existing cellular base
stations (BSs). To further explore the performance limits of hybrid cellular
and cell-free networks, this paper develops a hybrid network model based on
stochastic geometric toolkits, which reveals the coupling of the signal and
interference from both the cellular and cell-free networks. Specifically, the
conjugate beamforming is applied in hybrid cellular and cell-free networks,
which enables user equipment (UE) to benefit from both cellular BSs and
cell-free APs. The aggregate signal received from the hybrid network is
approximated via moment matching, and coverage probability is characterized by
deriving the Laplace transform of the interference. The analysis of signal
strength and coverage probability is verified by extensive simulations.
