The ban follows Expresso's performance in the latest quality of service monitoring of cellular mobile voice services report conducted by the NCA.
According to the report, Expresso had operational challenges in all the three Northern regions as well as the Eastern and Volta regions.
Expresso network was not available in all three Northern regions at the time of testing due to total outage of its systems serving the three regions.
The report measured four key items including Stand-alone Dedicated Control Channel (SDCCH) Congestion Rate, Call Setup Time (CST), Call Congestion Rate and Call Drop Rate (CDR).
In NCA's recent market share report for February this year it revealed that Expresso continued with its decline in market share losing about 15 000 subscribers representing 9 percent of its subscriber base.
With about 154 000 subscribers, Expresso owns about 0.5 percent of the mobile voice telephony market.
Meanwhile, the NCA report revealed all operators had call setup delays in certain locations, which is the period of time elapsing from the sending of a target telephone number to the setting up of a call to the receiving terminal.
The NCA has also notified telecom operators of the findings in the report and suspended sanctions to defaulters pending their performance in the next monitoring findings in the same regions.
It also accused MTN of failing to comply with the Call Drop license threshold of less than three percent in all localities tested.
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