For Iphone 6.
 

Hello guys.
I have a question of the Sim card. I arrived Germany few weeks ago. And i think i'll stay in germany for 1 year. Therefore, i want to buy the Sim Card for Iphone 6.
Which Sim card company, do you recommend? I'm considering what buy the Lidl Simcard. And i don't know which size of Simcard, i should buy. Can you advise to me??

Thank you and hope you have a nice day.