Two questions about the o2 prepaid

1. What if the duration of two prepaid tariffs overlap with each other? Am I allowed to do that?

• If I used the "prepaid M" for two weeks(middle of the duration), but the data volume is used up. Can I just immediately buy another "prepaid S"? Will the old bundle conflict with each other?
• If I used the the “prepaid Basic” for two weeks(middle of the duration), and suddenly want to buy a "prepaid M" immediately, what will happen? Will the "prepaid M" immediately become valid?

2. I am thinking about how to transfer my phone number from prepaid lebara.de to o2 prepaid, but I only saw the toturials from the old contract to the new contract. Is it allowed to transfer to o2 prepaid?

Edit by o2_Andrea: verschoben von Mobilfunk: Vertrag & Tarife zu English o2 Community: Mobile