diff --git a/include/proto.h b/include/proto.h
index 2a56c5d94..b2ccb6847 100644
--- a/include/proto.h
+++ b/include/proto.h
@@ -101,6 +101,7 @@ void log_crosspost_in_allpost(const char *brd, const fileheader_t *postfile);
 #ifdef USE_COOLDOWN
 int check_cooldown(boardheader_t *bp);
 #endif
+bool is_user_sms_verified();
 
 /* board */
 #define setutmpbid(bid) currutmp->brc_id=bid;
diff --git a/include/pttstruct.h b/include/pttstruct.h
index 38f2047a0..6ed092d1d 100644
--- a/include/pttstruct.h
+++ b/include/pttstruct.h
@@ -232,6 +232,7 @@ typedef struct boardheader_t { /* 256 bytes */
 #define BRD_ALIGNEDCMT		0x04000000	/* 對齊式的推文 */
 #define BRD_NOSELFDELPOST       0x08000000      /* 不可自刪 */
 #define BRD_BM_MASK_CONTENT	0x10000000	/* 允許板主刪除特定文字 */
+#define BRD_NEEDS_SMS_VERIFICATION   0x20000000  /* 允許版主設定看板發文需完成過簡訊認證 */
 
 // Board group linked-list type. Used for array index of firstchild and next.
 #define BRD_GROUP_LL_TYPE_NAME  (0)
diff --git a/mbbsd/bbs.c b/mbbsd/bbs.c
index 481635e0a..58074587a 100644
--- a/mbbsd/bbs.c
+++ b/mbbsd/bbs.c
@@ -433,6 +433,38 @@ int IsFreeBoardName(const char *brdname)
     return 0;
 }
 
+/*
+ * Check if user phone number is verified by sms
+ *
+ * This function will check is current user have already register their
+ * phone number with verifydb library.
+ * The verify process is modified from verifydb_check_vmethod_unused,
+ * it will pass cuser.userid and cuser.firstlogin as parameter and find
+ * VMETHOD_SMS record.
+ *
+ * Note that, ptt system might has two different user has the same userid
+ * but won't be happen in same time, so we need firstlogin as second
+ * parameter, and ptt accept Taiwan phone register only since Jul. 2021
+ * so we can just verify whether in database.
+ *
+ * Return true when user has verified phone, false when no register record
+ */
+bool
+is_user_sms_verified()
+{
+    Bytes buf;
+    const VerifyDb::GetReply *reply;
+    if (!verifydb_getuser(cuser.userid, cuser.firstlogin, &buf, &reply)) {
+        // The verifydb may occur some problem, maybe we should log it and
+        // notifiy SYSOP?
+        return false;
+    }
+    if (verifydb_find_vmethod(reply, VMETHOD_SMS)) {
+        return true;
+    }
+    return false;
+}
+
 int
 CheckModifyPerm(const char **preason)
 {
diff --git a/mbbsd/board.c b/mbbsd/board.c
index c84b0d2f0..5c1b7a1ff 100644
--- a/mbbsd/board.c
+++ b/mbbsd/board.c
@@ -496,6 +496,11 @@ b_config(void)
 		(bp->brdattr & BRD_OVER18) ?
 		ANSI_COLOR(1) "禁止 " : "允許\ " );
 
+	prints( " " ANSI_COLOR(1;36) "t" ANSI_RESET
+		" - %s" ANSI_RESET "已驗證台灣門號發/推文\n",
+		(bp->brdattr & BRD_TAIWAN_PHONE_ONLY) ?
+		ANSI_COLOR(1) "限定 " : "不限定 " );
+
 	if (!canpost)
 	    outs(ANSI_COLOR(1;31)"  ★ 您在此看板無發文或推文權限，"
 		"詳細原因請參考上面顯示為紅色或有 * 的項目。"ANSI_RESET"\n");
@@ -813,6 +818,11 @@ b_config(void)
 		}
 		break;
 
+		case 't':
+		bp->brdattr ^= BRD_NEEDS_SMS_VERIFICATION;
+		touched = 1;
+		break;
+
 	    case 'v':
 		clear();
 		friend_edit(BOARD_VISABLE);
diff --git a/mbbsd/cache.c b/mbbsd/cache.c
index a82146913..99e98685c 100644
--- a/mbbsd/cache.c
+++ b/mbbsd/cache.c
@@ -233,6 +233,10 @@ postperm_msg(const char *bname)
     assert(0<=i-1 && i-1<MAX_BOARD);
     bp = getbcache(i);
 
+    if (bp->brdattr & BRD_TAIWAN_PHONE_ONLY)
+        if (!is_user_sms_verified())
+            return "看板限定已驗證台灣門號發/推文";
+
     if (bp->brdattr & BRD_GUESTPOST)
         return NULL;