Playing with a cell phone is not likely to cause a woman to miscarry, neither to cause a pre-eclampsia nor to cause a spontaneous abortion, and playing with a cell phone does not have much effect on the growth and development of the fetus. If a woman has a miscarriage, it is not considered to be caused by playing with a cell phone, but rather by the abnormal quality of the embryo itself, or by a poor environment in the uterine cavity, or even by the presence of various viral infections. In case of preterm miscarriage, one can also consider taking progesterone capsules and birth control for corresponding birth control treatment. However, if there is already a spontaneous miscarriage, or an indolent miscarriage, you can only consider preparing for pregnancy next time. Moreover, after an indolent miscarriage, an operation to remove the residual tissues will be required to avoid affecting the next pregnancy preparation.