Ewu is in South South Nigeria.
Ewu is a Nigerian city in Esan Central Local Government Area in the Edo State of Nigeria.
You would most likely find a reliable coverage of the 2G/3G/4G mobile networks in most locations in Ewu. Signal strength is adequate at almost every point in the city, and you are less likely to experience network outage for any of the mobile phone service providers in any of the areas of the city.
MTN, 9Mobile, Airtel (Zain) and GLO are all available service providers. So if you are planning a visit to Ewu, you might not have to be so much concerned about the service provider to choose from as they all are reasonably reliable. But from observed indications, GLO seems to perform well than the others, though its rates may be high and its offers and services might be stringent, but you are less likely to be concerned of erratic voice and data connection compared to others.
Airtel is another service provider which is fairly satisfactory for all you might need to connect to the world, including rates and network reliability. Of course, Glo (or Globacom) boasts of fast network speed for internet browsing activities, only that you might not be able to enjoy the privilege in some locations. And 9Mobile (formerly Etisalat) usually also performs well in internet browsing speed too but with locational limitations as well, plus data rate is fairly higher.