diff --git a/suites/sms/mo_mt_sms.py b/suites/sms/mo_mt_sms.py
index 860f5e7..4e0ba08 100755
--- a/suites/sms/mo_mt_sms.py
+++ b/suites/sms/mo_mt_sms.py
@@ -14,13 +14,15 @@
 nitb.subscriber_add(ms_mo)
 nitb.subscriber_add(ms_mt)
 
-ms_mo.connect(nitb)
-ms_mt.connect(nitb)
+ms_mo.connect(nitb.mcc_mnc())
+ms_mt.connect(nitb.mcc_mnc())
 
 ms_mo.log_info()
 ms_mt.log_info()
 
 print('waiting for modems to attach...')
+wait(ms_mo.is_connected, nitb.mcc_mnc())
+wait(ms_mt.is_connected, nitb.mcc_mnc())
 wait(nitb.subscriber_attached, ms_mo, ms_mt)
 
 sms = ms_mo.sms_send(ms_mt)