Introduction I am a mobile customer of M1 Limited. I am paying subscription charges of SGD43.64 which includes $5 SGD towards IDD 021 saver. M1 claims that its IDD 021 gives you savings of up to 77% on international call rates (compared with SingTel 013). M1 gives you an IDD saver on IDD 021. If you opt for this saver all the IDD calls made with prefix 021 will be charged under local outgoing voice calls. To dial an international number you have to dial 021 - <ISD> - <Area> - <Phone> e.g. if I have to call a number... read full review »