Display screen of a mobile terminal or portion thereof with a graphical user interface

FIG. 1 is a front view of a display screen of a mobile terminal or portion thereof with a graphical user interface showing my new design, the graphical user interface is shown separately for clarity of illustration;

FIG. 2 is a front view of a display screen of a mobile terminal or portion thereof with a graphical user interface showing my new design; and,

FIG. 3 is a front perspective view of FIG. 2 .

The broken line showing of the mobile terminal in FIGS. 2 and 3 , and of the text/words, numbers and graphical elements in FIGS. 1 , 2 , and 3 are for illustrative purposes and forms no part of the claimed design.

The Facebook mark or trademark in the lower center portion of the Figures and the Twitter mark or trademark in the lower center portion of the Figures are not part of the claimed design. The Facebook mark or trademark is a registered trademark or the property of Facebook, Inc. and the Twitter mark or trademark is a registered trademark or the property of Twitter, Inc.