sliding channels of the body 90 defined by the guiding slots 12 and 22 of the upper and lower casing members via the entry openings defined by the open ends 121 and 221 of the upper and lower casing member 30 and 40 with the flat plate member of the clamp members 30 and 40 sliding through the longitudinal edges opening slots of the body 90 this is illustrated in fig4 the selective engagement of the strip like segments 31 32 and 41 42 of the clamp members 30 and 40 with the sliding channels of the body 90 allows the clamp members 30 and 40 to adjust their locations relative to the body 90 and thus change the distance between the clamp members 30 and 40 in which the mobile phone 60 is received this provides the size adjustability of the mobile phone holder 100 of the present invention the closed end of the upper and lower casing members 10 and 20 together with the raised walls 14 define a stop for the sliding movement of the clamp members 10 and 20 relative to the body 90 each of the clamp members 30 and 40 is provided with a plurality of.