usally it means that the sim card is dirty. Here is a few steps to do that MIGHT get it working:
1. Turn phone off.
2. Pop out the sim card
3. Leave sit for about either 10 seconds or minutes then put sim back in and turn on.
If that doesn't help I don't know what will
if you have a iOS beta version installed then uninstall it. If that doesnβt work you might have get A SIM card swap
I keep getting a message that No SIM on my phone. How do I handle it?
In some situations, the status bar on your iPhone might display No SIM, even though your iPhone has a SIM card.
the iphone has a sim card which slots in the top of the iphone. to get the sim card tray out you have to use a pin or the special tool it came with to open it.
Of course, the iPhone 3G and/or the original iPhone will take any normal sim card; the 3G iPhone will take the 3G sim as well.
The iphone 4 comes with a micro sim. Your normal sim will not work with it. My AT&T dealer says he can transfer data directly from your sim/old phone to your new iphone 4.
You can fit a SIM card from your HTC Wildfire to an iPhone 4 by using the SIM port included in the iPhone.
You will be able to get the services in a Bell iPhone if you use a Komondo SIM card.
You can use the same SIM card for your iPhone 6 that you used in your iPhone 5.
No sim cards are only for numbers
No, You cannot use reliance CDMA sim card (or) any other CDMA card sim card on Apple iphone 4s. Any GSM Sim card will work on factory unlocked Apple iphone 4s but not CDMA sim ONLY IN INDIA.
all iphones have a sim slot but on the original iphone the customer cannot easily access it whereas the 3G iphone has the sim card and a sim card ejector tool How can I access my verizon iphone 4 sim card slot that doesn't have a sim tray
No, the sim card is located in the top of the phone only.
It depends if the original phone the SIM card belonged to was saving them to the SIM card itself. Here's some clarification: The SIM card will retain contacts from a previous phone. The iPhone will not recognize SIM contacts until they are imported to the Contact list via Settings > Mail, Contacts, Calendars > Import SIM Contacts The iPhone does not save contacts to the SIM card, and therefore if the SIM is from an old iPhone there won't be any SIM contacts present.