Hello O2 / Community, it’s really cool that you provide support in English, thank you!
First of all, sorry for the long text. I hope someone can help. 
I have DSL from O2 in Germany. The plan is called „O2 DSL Classic S“ (previously „O2 DSL Young 50/10“) and should have 50mbit down and 10mbit up. The whole time however, I only get 26mbit down and 5mbit up. I have tried with different speedtest providers (Breitbandmessung, Ookla, Telekom, Google etc) during a long time period, with different computers and always with LAN cable to the router. The router/modem is a Fritzbox 7490 with the latest software version.
So, this speed is not so nice for the price of 29,99€/month and I need a change/fix… On the positive side, the connection is at least stable and the plan is over 24 months so I can cancel it on a months notice.
Possible solution 1:
If I log in to the Fritzbox Router Admin and look under „DSL-Informationen“ -> „Leistungskapazität“ it says the connection is actually capable of 105mbit down/35mbit up. It says it is connected via a VDSL2 17a with full G.Vector capacity. See images included below. I have also tried resetting the router but it does not change anything.
Could it be that some (V)DSL channel is set wrong on the O2 side (like a human error?) which will be an easy fix?
Possible solution 2:
If I do a DSL availability check on the O2 website I get the message that 250mbit is possible on my address. If I do the same on the Telekom website I get max 175mbit possible. I assume the Telekom information is a bit more accurate since they are providing the actual physical cables but I am no technical expert. 
If a much better speed than now could be guaranteed and the price is right I might want to upgrade to this 250mbit plan from O2 instead of moving to another provider. Can someone from the O2 support team then help me here to change to this service?
Some questions in this case:
- There is currently a deal on the O2 website offering 250mbit for 34,99€/month (10€ discount forever) with 34,99€ as a one-time connection fee. It’s called O2 My Home XL. Can I get this deal as a current customer with my current plan?
- Should I expect a period of down-time when the plans change? How many days could this be? I just need to plan it since I work from home.
- If I change to the 250mbit plan and am not satisfied, can I then problem-free downgrade to for example a 100mbit plan (O2 my Home L) within a 2 week online purchase regrettal period?
- On a faster plan (250mbit) will the VDSL2 17a automatically change to a super vectoring 35b to guarantee the highest connection quality and speed? I read on a forum that I should ask about that.
Some infos:
- I am interested in DSL, not cable (I don’t see any pros for choosing cable).
- I recently bought a Fritzbox 7590AX (it is still unused) so I believe I do not need a router upgrade since it can do super vectoring. If „solution 2“ is not possible I will return the 7590AX, I don’t think I need it.
Thank you in advance for your help!
