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It has been shown that gaps exist in the useful coverage service area of a cell and the reliability of coverage drops due to buildings as well as interference in CDMA cells. We have used the generalized poisson process to model the areas where signal level fall below threshold and formulated the mathematical definition of useful service area in the presence of relays. We used approaches "with replacement" and "without replacement" of idle mobiles to serve as relays or intermediaries. We also use a constraint to make sure that the intermediary doesn't fall in a below threshold area. Monte Carlo simulations show that 2-hop relaying can increase the useful service coverage area by 4-14% in sparse and heavy building density areas.