After ordering the SIM card has been sent quickly and the activation was easily. I recommend to all who change their contract and want to take their number to terminate it in advance and wait for the confirmation of termination. Then in the activation of the SIM card, the expiration of the old contract and therefore the date of number portability are equal on this day. One gets then a short time later an email with the confirmation of the number porting on the specified dates. This has everything worked smoothly and seamlessly with me.
At home and at work, I have good reception in the O2 network, just as good as before in the D1 network.
This tariff is highly recommended, as it remains very flexible by the monthly cancellation possibility.
