What sort of rates are charged with the SIM cards?
Traffic is charged in increments of 1 kB with all operators except the following, with which it is charged in increments of 10 kB: Bahrain (Zain BH), Equatorial Guinea (Greencom), The Gambia (Africell), Israel (Hot Mobile), Malawi (Airtel Africa), Malaysia (Celcom), Moldova (Moldcell), New Caledonia (OPT), Oman (Oman Mobile), Pakistan (Warid, Ufone), Russia (Vimpelcom), Sri Lanka (Mobitel), Sierra Leone (Africell), Vietnam (Vietnamobile), Iran (MTN).