A fixer for handheld, portable, mobile devices, the fixer comprising: an extension rod; a positioning frame, deposited at one end of the extension rod, for holding and positing an external mobile device; a surface of the positioning frame for contacting the mobile device being covered by a cushion for helping the positioning frame to engage with a surface of the mobile device; a securing member, deposited at an opposite end of the extension rod, for attaching and securing the extension rod and the positioning frame onto an external article, so as to suspend the mobile device, wherein the external article is a planar or a bar-like article; and a locking unit, deposited on the securing member, for fixing the securing member to the external article; wherein the extension rod is rigid in a vertical direction or in a horizontal direction, and the securing member is configured to grasp a horizontal or vertical, planar or bar-like article, so that when a user touches and operates the mobile device, the mobile device is strongly positioned over the external article by the extension rod and the locking unit, and is prevented from swinging and displacing, characterized in-that the extension rod is formed by telescoped tubes, so that the extension rod is allowed to have multi-stage extension, thereby increasing an overall using length of the extension rod and wherein the positioning frame includes a base, an immovable bracket deposited at one side of the base, and a movable bracket movably provided at an opposite side of the base; the movable bracket being movably provided at the opposite side of the base by slide, pull or rotation of a guide system, a rail system, a tooth-notch engagement system or a gear system; the movable bracket and the immovable bracket being adjusted to fittingly receive the mobile device and then the movable bracket being driven by a screw means, a hydraulic means, a pressuring means, a pulling spring, a suction means or a torque means to move toward the immovable bracket, so as to hold the mobile device firmly between the movable bracket and the immovable bracket regardless of how the mobile device is sized; and the base or the cushion of the positioning frame being provided with at least one sucking disc for holding the mobile device, thereby ensuring close connection between the positioning frame and the mobile device to make the mobile device get secured firmly, wherein the sucking disc is provided on the base or the cushion by forming integrally, adhering, embedding or inserting. an extension rod; a positioning frame, deposited at one end of the extension rod, for holding and positing an external mobile device; a surface of the positioning frame for contacting the mobile device being covered by a cushion for helping the positioning frame to engage with a surface of the mobile device; a securing member, deposited at an opposite end of the extension rod, for attaching and securing the extension rod and the positioning frame onto an external article, so as to suspend the mobile device, wherein the external article is a planar or a bar-like article; and a locking unit, deposited on the securing member, for fixing the securing member to the external article;