This study explores the comparative analysis of customer’s patronage before and after the application and use of POS in Nigeria informal sector with the aim of measuring the rate and level of increase in sales and service delivery in the sector. The exploratory study used qualitative data via in-depth interview of 20 participants across Adebayo, Old Garage, Fayose Market and Ajilosun using snowball sampling technique to select the participants. The qualitative data was analysed using content analysis and verbatim quotation. Findings showed that most of the participants unraveled the fact that POS application and use is an electronic device/facility that boost sales and service delivery in SMs in Nigeria, the rate and level of sales and service delivery cannot be compare with what obtained in those days, sales was even quantified by some participants as 60%-70% or 60%-80%. This achievement recorded above was a function of customers’ constant patronage in the informal sector and strict adherence to the cashless policy introduced by CBN. It was concluded that the rate and level of sales and service delivery in the informal sector with the adoption and use of POS cannot be compare with what is obtainable before POS was invented. POS application and use is an electronic device and a catalyst that enhance better sales and service delivery in informal sector in Nigeria.Keywords: POS, informal sector, sales, delivery, electronic devic