diff --git a/components/esp_modem/src/esp_modem_c_api.cpp b/components/esp_modem/src/esp_modem_c_api.cpp
index 9a927b416..6f5a6ad7f 100644
--- a/components/esp_modem/src/esp_modem_c_api.cpp
+++ b/components/esp_modem/src/esp_modem_c_api.cpp
@@ -281,7 +281,7 @@ extern "C" esp_err_t esp_modem_set_operator(esp_modem_dce_t *dce_wrap, int mode,
     if (dce_wrap == nullptr || dce_wrap->dce == nullptr) {
         return ESP_ERR_INVALID_ARG;
     }
-    std::string operator_str = std::string(oper);
+    std::string operator_str(oper);
     return command_response_to_esp_err(dce_wrap->dce->set_operator(mode, format, operator_str));
 }
 
@@ -348,7 +348,7 @@ extern "C" esp_err_t esp_modem_set_network_bands(esp_modem_dce_t *dce_wrap, cons
     if (dce_wrap == nullptr || dce_wrap->dce == nullptr) {
         return ESP_ERR_INVALID_ARG;
     }
-    std::string mode_str = std::string(mode);
+    std::string mode_str(mode);
     return command_response_to_esp_err(dce_wrap->dce->set_network_bands(mode, bands, size));
 }
 
diff --git a/components/esp_modem/src/esp_modem_command_library.cpp b/components/esp_modem/src/esp_modem_command_library.cpp
index 9b6be6691..8509e8b77 100644
--- a/components/esp_modem/src/esp_modem_command_library.cpp
+++ b/components/esp_modem/src/esp_modem_command_library.cpp
@@ -482,7 +482,7 @@ command_result set_network_bands(CommandableIf *t, const std::string& mode, cons
 {
     ESP_LOGV(TAG, "%s", __func__ );
     std::string band_string = "";
-    for (int i = 0; i<size-1; i++){
+    for (int i = 0; i<size-1; ++i){
         band_string += std::to_string(bands[i]) + ",";
     }
     band_string += std::to_string(bands[size-1]);
@@ -493,7 +493,7 @@ command_result set_network_bands(CommandableIf *t, const std::string& mode, cons
 command_result set_network_bands_sim76xx(CommandableIf *t, const std::string& mode, const int* bands, int size)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string any_mode = "0xFFFFFFFF7FFFFFFF";
+    //std::string any_mode = "0xFFFFFFFF7FFFFFFF";
     uint64_t band_bits = 0;
     for (int i = 0; i<size; ++i) {
         // OR-operation to add bands
@@ -501,8 +501,8 @@ command_result set_network_bands_sim76xx(CommandableIf *t, const std::string& mo
     }
     std::stringstream stream;
     stream << "0x" << std::setfill('0') << std::setw(16) << std::hex << band_bits;
-    std::string band_string = stream.str();
-    return generic_command_common(t, "AT+CNBP=" + any_mode + "," + band_string + "\r");
+    std::string band_string(stream.str());
+    return generic_command_common(t, "AT+CNBP=" + mode + "," + band_string + "\r");
 }
 
 command_result get_network_system_mode(CommandableIf *t, int &mode)