  Tele-correlation refers to the correlation of galaxy shapes with large
angular separations (e.g., $>100$ degrees). Since there are no astrophysical
reasons causing such a correlation on cosmological scales, any detected
tele-correlation could disclose systematic effects in shear-shear correlation
measurement. If the shear estimators are measured on single exposures, we show
that the field distortion (FD) signal associated with the galaxy position on
the CCD can be retained and used in tele-correlation to help us directly
calibrate the multiplicative and additive biases in shear-shear correlations.
We use the DECaLS shear catalog produced by the Fourier\_Quad pipeline to
demonstrate this idea. To our surprise, we find that significant multiplicative
biases can arise (up to more than 10\%) due to redshift binning of the
galaxies. Correction for this bias leads to about 1$\sigma$ increase of the
best-fit value of $S_8$ from $0.760^{+0.015}_{-0.017}$ to
$0.777^{+0.016}_{-0.019}$ in our tomography study.
