We investigated the electrical-transport properties of hydroiodic acid doped polyaniline in the temperature range 77-300 K, applying magnetic field strength to a maximum of 1 T in the frequency range 20 Hz-1 MHz. The direct-current conductivity was explained by variable range hopping theory, and the direct-current magnetoconductivity, which was positive, was interpreted by orbital magnetoconductivity theory. The alternating-current (ac) conductivity was found to follow the universal dielectric response sigma'(f) infinity f(s), where sigma'(f) is the frequency-dependent real part of the complex ac conductivity, f is the frequency, and s is the frequency exponent. The trend in the variation of s, the temperature dependence of the frequency exponent, corroborated the fact that the correlated barrier hopping was the dominating charge-transport mechanism. The ac conductivity also showed a positive variation with magnetic field, which could be interpreted by this theory. (C) 2008 Wiley Periodicals, Inc.