Hi you have had a couple of answers which are all good however if you had three on your dual sim phone and the smarty sim is replacing another network try resetting your network settings. It will delete all connection info including any Wi-Fi connect...
I had the exact same problem when I was using a pac to bring my number to smarty. All I could do was ask them to resubmit it complete the whole process again and the second time it went through. The network is worth it though since I’ve been using th...