https://community.48.ie/t5/Other-Help/Invalid-sim-error/m-p/38943#M15688 Might be that the iPhone needs activation.<BR />This process automatically sends a UK SMS which costs 25c.<BR />Try putting some cash credit on your account to cover this cost.<BR />Then switch off &amp; on and wait a bit out sync with iTunes.<BR />If that doesn't help then you may need to contact 48 support for advice:<BR /><BR /><A href="http://www.48months.ie/help#ask-a-48-agent" target="_blank">http://www.48months.ie/help#ask-a-48-agent</A><BR /><BR />Hope this helps. Mon, 04 Jan 2016 23:15:44 GMT dalyer 2016-01-04T23:15:44Z https://community.48.ie/t5/Other-Help/Invalid-sim-error/m-p/38938#M15687 I have a new unlocked iPhone. I activated sim with 48 and have membership but getting above error when I try to use phone. Mon, 04 Jan 2016 20:23:42 GMT https://community.48.ie/t5/Other-Help/Invalid-sim-error/m-p/38938#M15687 danc48 2016-01-04T20:23:42Z https://community.48.ie/t5/Other-Help/Invalid-sim-error/m-p/38943#M15688 Might be that the iPhone needs activation.<BR />This process automatically sends a UK SMS which costs 25c.<BR />Try putting some cash credit on your account to cover this cost.<BR />Then switch off &amp; on and wait a bit out sync with iTunes.<BR />If that doesn't help then you may need to contact 48 support for advice:<BR /><BR /><A href="http://www.48months.ie/help#ask-a-48-agent" target="_blank">http://www.48months.ie/help#ask-a-48-agent</A><BR /><BR />Hope this helps. Mon, 04 Jan 2016 23:15:44 GMT https://community.48.ie/t5/Other-Help/Invalid-sim-error/m-p/38943#M15688 dalyer 2016-01-04T23:15:44Z https://community.48.ie/t5/Other-Help/Invalid-sim-error/m-p/38949#M15689 Did that help at all? Tue, 05 Jan 2016 09:33:32 GMT https://community.48.ie/t5/Other-Help/Invalid-sim-error/m-p/38949#M15689 dalyer 2016-01-05T09:33:32Z