diff --git a/connectivity/cellular/include/cellular/framework/AT/AT_CellularDevice.h b/connectivity/cellular/include/cellular/framework/AT/AT_CellularDevice.h
index 20fe6c139e..07a5f90dad 100755
--- a/connectivity/cellular/include/cellular/framework/AT/AT_CellularDevice.h
+++ b/connectivity/cellular/include/cellular/framework/AT/AT_CellularDevice.h
@@ -67,7 +67,7 @@ public:
     };
 
 public:
-    AT_CellularDevice(FileHandle *fh);
+    AT_CellularDevice(FileHandle *fh, char *delim = "\r");
     virtual ~AT_CellularDevice();
 
     virtual nsapi_error_t clear();
diff --git a/connectivity/cellular/source/framework/AT/AT_CellularDevice.cpp b/connectivity/cellular/source/framework/AT/AT_CellularDevice.cpp
index 83ab47a3c4..e3fd5b551a 100644
--- a/connectivity/cellular/source/framework/AT/AT_CellularDevice.cpp
+++ b/connectivity/cellular/source/framework/AT/AT_CellularDevice.cpp
@@ -39,9 +39,9 @@ using namespace std::chrono_literals;
 #define DEFAULT_AT_TIMEOUT 1s // at default timeout
 const int MAX_SIM_RESPONSE_LENGTH = 16;
 
-AT_CellularDevice::AT_CellularDevice(FileHandle *fh) :
+AT_CellularDevice::AT_CellularDevice(FileHandle *fh, char *delim):
     CellularDevice(),
-    _at(fh, _queue, DEFAULT_AT_TIMEOUT, "\r"),
+    _at(fh, _queue, DEFAULT_AT_TIMEOUT, delim),
 #if MBED_CONF_CELLULAR_USE_SMS
     _sms(0),
 #endif // MBED_CONF_CELLULAR_USE_SMS
diff --git a/connectivity/cellular/tests/UNITTESTS/doubles/AT_CellularDevice_stub.cpp b/connectivity/cellular/tests/UNITTESTS/doubles/AT_CellularDevice_stub.cpp
index f65362bcde..300962bd7a 100644
--- a/connectivity/cellular/tests/UNITTESTS/doubles/AT_CellularDevice_stub.cpp
+++ b/connectivity/cellular/tests/UNITTESTS/doubles/AT_CellularDevice_stub.cpp
@@ -33,9 +33,9 @@ bool AT_CellularDevice_stub::pin_needed = false;
 bool AT_CellularDevice_stub::supported_bool = false;
 int AT_CellularDevice_stub::max_sock_value = 1;
 
-AT_CellularDevice::AT_CellularDevice(FileHandle *fh) :
+AT_CellularDevice::AT_CellularDevice(FileHandle *fh, char *delim) :
     CellularDevice(),
-    _at(fh, _queue, get_property(AT_CellularDevice::PROPERTY_AT_SEND_DELAY), "\r"),
+    _at(fh, _queue, get_property(AT_CellularDevice::PROPERTY_AT_SEND_DELAY), delim),
 #if MBED_CONF_CELLULAR_USE_SMS
     _sms(0),
 #endif // MBED_CONF_CELLULAR_USE_SMS