diff --git a/TestPhone.st b/TestPhone.st
index 13aa9fb..681a758 100644
--- a/TestPhone.st
+++ b/TestPhone.st
@@ -142,7 +142,8 @@ Object subclass: IPAConfig [
             yourself
     ]
     sendLU: aPhone [
-        (self doLU: aPhone) waitForTermination.
+        (self doLU: aPhone)
+            openConnection; waitForTermination.
     ]
 
     doCallNumber: aPhone nr: aNr [
@@ -152,7 +153,8 @@ Object subclass: IPAConfig [
     ]
 
     callNumber: aPhone nr: aNumber [
-        ^ (self doCallNumber: aPhone nr: aNumber) waitForTermination.
+        ^ (self doCallNumber: aPhone nr: aNumber)
+            openConnection; waitForTermination.
     ]
 
     doUSSD: aPhone nr: aNr [
@@ -162,7 +164,8 @@ Object subclass: IPAConfig [
     ]
 
     sendUSSD: aPhone nr: aNr [
-        ^ (self doUSSD: aPhone nr: aNr) waitForTermination.
+        ^ (self doUSSD: aPhone nr: aNr)
+            openConnection; waitForTermination.
     ]
 ]