The embodiment of the invention discloses a method for treating network communication function abnormity. The method comprises the steps that a modem detects MT (mobile terminating)/MO (mobile original) call failure; the modem acquires a first protocol stack used by the modem at present; the modem closes the first protocol stack and selects a second protocol stack except the first protocol stack from a plurality of protocol stacks supported by the modem; the modem opens the second protocol stack and uses the second protocol stack to carry out network registration; and if network registration is successful, the modem records the present location information. The embodiment of the invention also discloses the modem and a mobile terminal. Abnormity of the network communication function can be rapidly detected and recovered by adopting the method.