diff --git a/drivers/atmodem/call-barring.c b/drivers/atmodem/call-barring.c
index b1d29008..54bdf938 100644
--- a/drivers/atmodem/call-barring.c
+++ b/drivers/atmodem/call-barring.c
@@ -197,7 +197,7 @@ static int at_call_barring_probe(struct ofono_call_barring *cb,
 {
 	GAtChat *chat = user;
 
-	ofono_call_barring_set_data(cb, chat);
+	ofono_call_barring_set_data(cb, g_at_chat_clone(chat));
 	g_idle_add(at_call_barring_register, cb);
 
 	return 0;
@@ -205,6 +205,10 @@ static int at_call_barring_probe(struct ofono_call_barring *cb,
 
 static void at_call_barring_remove(struct ofono_call_barring *cb)
 {
+	GAtChat *chat = ofono_call_barring_get_data(cb);
+
+	g_at_chat_unref(chat);
+	ofono_call_barring_set_data(cb, NULL);
 }
 
 static struct ofono_call_barring_driver driver = {
diff --git a/drivers/atmodem/call-forwarding.c b/drivers/atmodem/call-forwarding.c
index 72a01883..7e7b9983 100644
--- a/drivers/atmodem/call-forwarding.c
+++ b/drivers/atmodem/call-forwarding.c
@@ -259,7 +259,7 @@ static int at_ccfc_probe(struct ofono_call_forwarding *cf, unsigned int vendor,
 {
 	GAtChat *chat = data;
 
-	ofono_call_forwarding_set_data(cf, chat);
+	ofono_call_forwarding_set_data(cf, g_at_chat_clone(chat));
 	g_idle_add(at_ccfc_register, cf);
 
 	return 0;
@@ -267,6 +267,10 @@ static int at_ccfc_probe(struct ofono_call_forwarding *cf, unsigned int vendor,
 
 static void at_ccfc_remove(struct ofono_call_forwarding *cf)
 {
+	GAtChat *chat = ofono_call_forwarding_get_data(cf);
+
+	g_at_chat_unref(chat);
+	ofono_call_forwarding_set_data(cf, NULL);
 }
 
 static struct ofono_call_forwarding_driver driver = {
diff --git a/drivers/atmodem/call-meter.c b/drivers/atmodem/call-meter.c
index 38774d41..4973e957 100644
--- a/drivers/atmodem/call-meter.c
+++ b/drivers/atmodem/call-meter.c
@@ -348,6 +348,7 @@ static int at_caoc_probe(struct ofono_call_meter *cm, unsigned int vendor,
 {
 	GAtChat *chat = data;
 
+	chat = g_at_chat_clone(chat);
 	ofono_call_meter_set_data(cm, chat);
 
 	g_at_chat_send(chat, "AT+CAOC=2", NULL, NULL, NULL, NULL);
@@ -359,6 +360,10 @@ static int at_caoc_probe(struct ofono_call_meter *cm, unsigned int vendor,
 
 static void at_caoc_remove(struct ofono_call_meter *cm)
 {
+	GAtChat *chat = ofono_call_meter_get_data(cm);
+
+	g_at_chat_unref(chat);
+	ofono_call_meter_set_data(cm, NULL);
 }
 
 static struct ofono_call_meter_driver driver = {
diff --git a/drivers/atmodem/call-settings.c b/drivers/atmodem/call-settings.c
index 2a3ec42e..ef9ff23d 100644
--- a/drivers/atmodem/call-settings.c
+++ b/drivers/atmodem/call-settings.c
@@ -339,7 +339,7 @@ static int at_call_settings_probe(struct ofono_call_settings *cs,
 {
 	GAtChat *chat = data;
 
-	ofono_call_settings_set_data(cs, chat);
+	ofono_call_settings_set_data(cs, g_at_chat_clone(chat));
 	g_idle_add(at_call_settings_register, cs);
 
 	return 0;
@@ -347,6 +347,10 @@ static int at_call_settings_probe(struct ofono_call_settings *cs,
 
 static void at_call_settings_remove(struct ofono_call_settings *cs)
 {
+	GAtChat *chat = ofono_call_settings_get_data(cs);
+
+	g_at_chat_unref(chat);
+	ofono_call_settings_set_data(cs, NULL);
 }
 
 static struct ofono_call_settings_driver driver = {
diff --git a/drivers/atmodem/call-volume.c b/drivers/atmodem/call-volume.c
index d44789b0..31288d06 100644
--- a/drivers/atmodem/call-volume.c
+++ b/drivers/atmodem/call-volume.c
@@ -189,15 +189,15 @@ static int at_call_volume_probe(struct ofono_call_volume *cv,
 	DBG("%p", cv);
 
 	cvd = g_new0(struct cv_data, 1);
-	cvd->chat = chat;
+	cvd->chat = g_at_chat_clone(chat);
 
 	ofono_call_volume_set_data(cv, cvd);
 
-	g_at_chat_send(chat, "AT+CMUT?", cmut_prefix,
+	g_at_chat_send(cvd->chat, "AT+CMUT?", cmut_prefix,
 			cmut_query, cv, NULL);
-	g_at_chat_send(chat, "AT+CLVL=?", clvl_prefix,
+	g_at_chat_send(cvd->chat, "AT+CLVL=?", clvl_prefix,
 			clvl_range_query, cv, NULL);
-	g_at_chat_send(chat, "AT+CLVL?", clvl_prefix,
+	g_at_chat_send(cvd->chat, "AT+CLVL?", clvl_prefix,
 			clvl_query, cv, NULL);
 
 	/* Generic driver does not support microphone level */
@@ -212,6 +212,7 @@ static void at_call_volume_remove(struct ofono_call_volume *cv)
 
 	ofono_call_volume_set_data(cv, NULL);
 
+	g_at_chat_unref(cvd->chat);
 	g_free(cvd);
 }
 
diff --git a/drivers/atmodem/cbs.c b/drivers/atmodem/cbs.c
index a1c40377..4eadd1f6 100644
--- a/drivers/atmodem/cbs.c
+++ b/drivers/atmodem/cbs.c
@@ -237,12 +237,12 @@ static int at_cbs_probe(struct ofono_cbs *cbs, unsigned int vendor,
 	struct cbs_data *data;
 
 	data = g_new0(struct cbs_data, 1);
-	data->chat = chat;
+	data->chat = g_at_chat_clone(chat);
 	data->vendor = vendor;
 
 	ofono_cbs_set_data(cbs, data);
 
-	g_at_chat_send(chat, "AT+CSCB=?", cscb_prefix,
+	g_at_chat_send(data->chat, "AT+CSCB=?", cscb_prefix,
 			at_cscb_support_cb, cbs, NULL);
 
 	return 0;
@@ -254,6 +254,7 @@ static void at_cbs_remove(struct ofono_cbs *cbs)
 
 	ofono_cbs_set_data(cbs, NULL);
 
+	g_at_chat_unref(data->chat);
 	g_free(data);
 }
 
diff --git a/drivers/atmodem/devinfo.c b/drivers/atmodem/devinfo.c
index e4b070b6..af24d853 100644
--- a/drivers/atmodem/devinfo.c
+++ b/drivers/atmodem/devinfo.c
@@ -188,7 +188,7 @@ static int at_devinfo_probe(struct ofono_devinfo *info, unsigned int vendor,
 {
 	GAtChat *chat = data;
 
-	ofono_devinfo_set_data(info, chat);
+	ofono_devinfo_set_data(info, g_at_chat_clone(chat));
 	g_idle_add(at_devinfo_register, info);
 
 	return 0;
@@ -196,6 +196,10 @@ static int at_devinfo_probe(struct ofono_devinfo *info, unsigned int vendor,
 
 static void at_devinfo_remove(struct ofono_devinfo *info)
 {
+	GAtChat *chat = ofono_devinfo_get_data(info);
+
+	g_at_chat_unref(chat);
+	ofono_devinfo_set_data(info, NULL);
 }
 
 static struct ofono_devinfo_driver driver = {
diff --git a/drivers/atmodem/gprs-context.c b/drivers/atmodem/gprs-context.c
index 65895607..a9d69c6c 100644
--- a/drivers/atmodem/gprs-context.c
+++ b/drivers/atmodem/gprs-context.c
@@ -249,7 +249,7 @@ static int at_gprs_context_probe(struct ofono_gprs_context *gc,
 	struct gprs_context_data *gcd;
 
 	gcd = g_new0(struct gprs_context_data, 1);
-	gcd->chat = chat;
+	gcd->chat = g_at_chat_clone(chat);
 
 	ofono_gprs_context_set_data(gc, gcd);
 
@@ -268,6 +268,8 @@ static void at_gprs_context_remove(struct ofono_gprs_context *gc)
 	}
 
 	ofono_gprs_context_set_data(gc, NULL);
+
+	g_at_chat_unref(gcd->chat);
 	g_free(gcd);
 }
 
diff --git a/drivers/atmodem/gprs.c b/drivers/atmodem/gprs.c
index bf82d066..a6c9c26c 100644
--- a/drivers/atmodem/gprs.c
+++ b/drivers/atmodem/gprs.c
@@ -306,12 +306,12 @@ static int at_gprs_probe(struct ofono_gprs *gprs,
 	struct gprs_data *gd;
 
 	gd = g_new0(struct gprs_data, 1);
-	gd->chat = chat;
+	gd->chat = g_at_chat_clone(chat);
 	gd->vendor = vendor;
 
 	ofono_gprs_set_data(gprs, gd);
 
-	g_at_chat_send(chat, "AT+CGDCONT=?", cgdcont_prefix,
+	g_at_chat_send(gd->chat, "AT+CGDCONT=?", cgdcont_prefix,
 			at_cgdcont_test_cb, gprs, NULL);
 
 	return 0;
@@ -322,6 +322,8 @@ static void at_gprs_remove(struct ofono_gprs *gprs)
 	struct gprs_data *gd = ofono_gprs_get_data(gprs);
 
 	ofono_gprs_set_data(gprs, NULL);
+
+	g_at_chat_unref(gd->chat);
 	g_free(gd);
 }
 
diff --git a/drivers/atmodem/network-registration.c b/drivers/atmodem/network-registration.c
index b8ec012c..04cd226e 100644
--- a/drivers/atmodem/network-registration.c
+++ b/drivers/atmodem/network-registration.c
@@ -1083,12 +1083,12 @@ static int at_netreg_probe(struct ofono_netreg *netreg, unsigned int vendor,
 
 	nd = g_new0(struct netreg_data, 1);
 
-	nd->chat = chat;
+	nd->chat = g_at_chat_clone(chat);
 	nd->vendor = vendor;
 	nd->tech = -1;
 	ofono_netreg_set_data(netreg, nd);
 
-	g_at_chat_send(chat, "AT+CREG=?", creg_prefix,
+	g_at_chat_send(nd->chat, "AT+CREG=?", creg_prefix,
 			at_creg_test_cb, netreg, NULL);
 
 	return 0;
@@ -1100,6 +1100,7 @@ static void at_netreg_remove(struct ofono_netreg *netreg)
 
 	ofono_netreg_set_data(netreg, NULL);
 
+	g_at_chat_unref(nd->chat);
 	g_free(nd);
 }
 
diff --git a/drivers/atmodem/phonebook.c b/drivers/atmodem/phonebook.c
index 5e7a52b4..89d090b1 100644
--- a/drivers/atmodem/phonebook.c
+++ b/drivers/atmodem/phonebook.c
@@ -511,7 +511,7 @@ static int at_phonebook_probe(struct ofono_phonebook *pb, unsigned int vendor,
 	struct pb_data *pbd;
 
 	pbd = g_new0(struct pb_data, 1);
-	pbd->chat = chat;
+	pbd->chat = g_at_chat_clone(chat);
 
 	ofono_phonebook_set_data(pb, pbd);
 
@@ -529,6 +529,7 @@ static void at_phonebook_remove(struct ofono_phonebook *pb)
 
 	ofono_phonebook_set_data(pb, NULL);
 
+	g_at_chat_unref(pbd->chat);
 	g_free(pbd);
 }
 
diff --git a/drivers/atmodem/sim.c b/drivers/atmodem/sim.c
index d5d5ff98..eb40ad71 100644
--- a/drivers/atmodem/sim.c
+++ b/drivers/atmodem/sim.c
@@ -810,15 +810,15 @@ static int at_sim_probe(struct ofono_sim *sim, unsigned int vendor,
 	struct sim_data *sd;
 
 	sd = g_new0(struct sim_data, 1);
-	sd->chat = chat;
+	sd->chat = g_at_chat_clone(chat);
 	sd->vendor = vendor;
 
 	switch (sd->vendor) {
 	case OFONO_VENDOR_WAVECOM:
-		g_at_chat_add_terminator(chat, "+CPIN:", 6, TRUE);
+		g_at_chat_add_terminator(sd->chat, "+CPIN:", 6, TRUE);
 		break;
 	case OFONO_VENDOR_MBM:
-		g_at_chat_send(chat, "AT*EPEE=1", NULL, NULL, NULL, NULL);
+		g_at_chat_send(sd->chat, "AT*EPEE=1", NULL, NULL, NULL, NULL);
 		break;
 	default:
 		break;
@@ -839,6 +839,7 @@ static void at_sim_remove(struct ofono_sim *sim)
 	if (sd->epev_source)
 		g_source_remove(sd->epev_source);
 
+	g_at_chat_unref(sd->chat);
 	g_free(sd);
 }
 
diff --git a/drivers/atmodem/sms.c b/drivers/atmodem/sms.c
index ba98c12f..37bdabe2 100644
--- a/drivers/atmodem/sms.c
+++ b/drivers/atmodem/sms.c
@@ -1212,12 +1212,12 @@ static int at_sms_probe(struct ofono_sms *sms, unsigned int vendor,
 	struct sms_data *data;
 
 	data = g_new0(struct sms_data, 1);
-	data->chat = chat;
+	data->chat = g_at_chat_clone(chat);
 	data->vendor = vendor;
 
 	ofono_sms_set_data(sms, data);
 
-	g_at_chat_send(chat, "AT+CSMS=?", csms_prefix,
+	g_at_chat_send(data->chat, "AT+CSMS=?", csms_prefix,
 			at_csms_query_cb, sms, NULL);
 
 	return 0;
@@ -1233,6 +1233,7 @@ static void at_sms_remove(struct ofono_sms *sms)
 	if (data->timeout_source > 0)
 		g_source_remove(data->timeout_source);
 
+	g_at_chat_unref(data->chat);
 	g_free(data);
 }
 
diff --git a/drivers/atmodem/ssn.c b/drivers/atmodem/ssn.c
index f219cdea..c0e20400 100644
--- a/drivers/atmodem/ssn.c
+++ b/drivers/atmodem/ssn.c
@@ -113,6 +113,8 @@ static int at_ssn_probe(struct ofono_ssn *ssn, unsigned int vendor,
 {
 	GAtChat *chat = data;
 
+	chat = g_at_chat_clone(chat);
+
 	ofono_ssn_set_data(ssn, chat);
 	g_at_chat_send(chat, "AT+CSSN=1,1", none_prefix,
 			at_ssn_initialized, ssn, NULL);
@@ -122,6 +124,10 @@ static int at_ssn_probe(struct ofono_ssn *ssn, unsigned int vendor,
 
 static void at_ssn_remove(struct ofono_ssn *ssn)
 {
+	GAtChat *chat = ofono_ssn_get_data(ssn);
+
+	g_at_chat_unref(chat);
+	ofono_ssn_set_data(ssn, NULL);
 }
 
 static struct ofono_ssn_driver driver = {
diff --git a/drivers/atmodem/stk.c b/drivers/atmodem/stk.c
index d6c19daa..2881a6dc 100644
--- a/drivers/atmodem/stk.c
+++ b/drivers/atmodem/stk.c
@@ -312,7 +312,7 @@ static int at_stk_probe(struct ofono_stk *stk, unsigned int vendor, void *data)
 	struct stk_data *sd;
 
 	sd = g_new0(struct stk_data, 1);
-	sd->chat = chat;
+	sd->chat = g_at_chat_clone(chat);
 	sd->vendor = vendor;
 
 	ofono_stk_set_data(stk, sd);
@@ -327,6 +327,7 @@ static void at_stk_remove(struct ofono_stk *stk)
 
 	ofono_stk_set_data(stk, NULL);
 
+	g_at_chat_unref(sd->chat);
 	g_free(sd);
 }
 
diff --git a/drivers/atmodem/ussd.c b/drivers/atmodem/ussd.c
index 555ce134..055b11f8 100644
--- a/drivers/atmodem/ussd.c
+++ b/drivers/atmodem/ussd.c
@@ -224,6 +224,7 @@ static int at_ussd_probe(struct ofono_ussd *ussd, unsigned int vendor,
 {
 	GAtChat *chat = data;
 
+	chat = g_at_chat_clone(chat);
 	ofono_ussd_set_data(ussd, chat);
 
 	g_at_chat_send(chat, "AT+CUSD=1", NULL, at_ussd_register, ussd, NULL);
@@ -233,6 +234,10 @@ static int at_ussd_probe(struct ofono_ussd *ussd, unsigned int vendor,
 
 static void at_ussd_remove(struct ofono_ussd *ussd)
 {
+	GAtChat *chat = ofono_ussd_get_data(ussd);
+
+	g_at_chat_unref(chat);
+	ofono_ussd_set_data(ussd, NULL);
 }
 
 static struct ofono_ussd_driver driver = {
diff --git a/drivers/atmodem/voicecall.c b/drivers/atmodem/voicecall.c
index 25787799..91b69384 100644
--- a/drivers/atmodem/voicecall.c
+++ b/drivers/atmodem/voicecall.c
@@ -841,14 +841,14 @@ static int at_voicecall_probe(struct ofono_voicecall *vc, unsigned int vendor,
 	struct voicecall_data *vd;
 
 	vd = g_new0(struct voicecall_data, 1);
-	vd->chat = chat;
+	vd->chat = g_at_chat_clone(chat);
 
 	ofono_voicecall_set_data(vc, vd);
 
-	g_at_chat_send(chat, "AT+CRC=1", NULL, NULL, NULL, NULL);
-	g_at_chat_send(chat, "AT+CLIP=1", NULL, NULL, NULL, NULL);
-	g_at_chat_send(chat, "AT+COLP=1", NULL, NULL, NULL, NULL);
-	g_at_chat_send(chat, "AT+CCWA=1", NULL,
+	g_at_chat_send(vd->chat, "AT+CRC=1", NULL, NULL, NULL, NULL);
+	g_at_chat_send(vd->chat, "AT+CLIP=1", NULL, NULL, NULL, NULL);
+	g_at_chat_send(vd->chat, "AT+COLP=1", NULL, NULL, NULL, NULL);
+	g_at_chat_send(vd->chat, "AT+CCWA=1", NULL,
 				at_voicecall_initialized, vc, NULL);
 	return 0;
 }
@@ -865,6 +865,7 @@ static void at_voicecall_remove(struct ofono_voicecall *vc)
 
 	ofono_voicecall_set_data(vc, NULL);
 
+	g_at_chat_unref(vd->chat);
 	g_free(vd);
 }