Just out of curiosity, how old is your current SIM card and how many different phones has it been used in? 
I've had my current nano-SIM since 2013, and used it in my former iPhone 5s and current 6.
	
		
			
		
		
	
				
			I've had my current nano-SIM since 2013, and used it in my former iPhone 5s and current 6.
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		