The ornamental design for a signwarning against texting, as shown.
FIG. 1 is a plan view of a first embodiment of a sign printed with a design and slogan to warn against texting;
FIG. 2 is a bottom view of the first embodiment showing the rear of the sign and right and left sides of the sign with broken lines, the top view being identical;
FIG. 3 is a right side view of the first embodiment showing the rear of the sign and top and bottom sides of the sign with broken lines, the left side view being identical;
FIG. 4 is a plan view of a second embodiment of a sign printed with a design and slogan to warn against texting;
FIG. 5 is a bottom view of the second embodiment showing the rear of the sign and right and left sides of the sign with broken lines, the top view being identical; and,
FIG. 6 is a right side view of the second embodiment showing the rear of the sign and top and bottom sides of the sign with broken lines, the left side view being identical.
The broken lines are for the purpose of illustrating dimensions of the embodiments of FIGS. 2 and 4 and form no part of the claimed design.