the only taxi i use in SD (when i need any, very occasionally) is maxi taxi. approved by miesposo as safe. he is all kinds worried when i am in SD on my own. in any case. maxi taxi is cheap, reliable and not so bad, apart from the fact that last time i used them they sent me a car older that me (achievable only with real effort), with no air con. but the driver knew where he was going and he took me there real quick...