  Let $\mathbb{K}$ be a field and $S=\mathbb{K}[x_1,\dots,x_n]$ be the
polynomial ring in $n$ variables over $\mathbb{K}$. Assume that $I\subset S$ is
a squarefree monomial ideal. For every integer $k\geq 1$, we denote the $k$-th
symbolic power of $I$ by $I^{(k)}$. Recently, Monta\~no and
N\'u\~nez-Betancourt \cite{mn} proved that for every pair of integers $m, k\geq
1$,$${\rm depth}(S/I^{(m)})\leq {\rm
depth}(S/I^{(\lceil\frac{m}{k}\rceil)}).$$We provide an alternative proof for
this inequality. Moreover, we reprove the known results that the sequence
$\{{\rm depth}(S/I^{(k)})\}_{k=1}^{\infty}$ is convergent and$$\min_k{\rm
depth}(S/I^{(k)})=\lim_{k\rightarrow \infty}{\rm
depth}(S/I^{(k)})=n-\ell_s(I),$$where $\ell_s(I)$ denotes the symbolic analytic
spread of $I$. We also determine an upper bound for the index of depth
stability of symbolic powers of $I$. Next, we consider the Stanley depth of
symbolic powers and prove that the sequences $\{{\rm
sdepth}(S/I^{(k)})\}_{k=1}^{\infty}$ and $\{{\rm
sdepth}(I^{(k)})\}_{k=1}^{\infty}$ are convergent and the limit of each
sequence is equal to its minimum. Furthermore, we determine an upper bound for
the indices of sdepth stability of symbolic powers.
