Singapore is investigating whether telco Simba complied with regulations governing the use of radio frequency bands. CNA looks at what these bands are and how they are managed. SINGAPORE: Singapore is investigating whether telecommunications company Simba complied with regulations governing the use of radio frequency bands. The Infocomm Media Development Authority (IMDA) said on Monday (May 18) that while reviewing the telco's proposed acquisition of M1 , it found that Simba could have been