If you are unable to complete the upgrade via the my world customer portal than you would have to call in to place the order yes.
I'd just like to clarify the pricing with you as well so there are no surprises. As Liz mentioned the activation fee of 95.00 will apply (114.99 if you have a dry loop) and the 25.00 speed change fee will not apply.
However this will be treated as a new service so the activation fee, plus the first month of 15Mb service, will be due when the order is placed. Then, if there is any time remaining on your current 6Mb service when the 15Mb is activated that time will be credited back on your next statement.
For the splitters they would work fine for the 15Mb as well, but there will likely been a POTS splitter installed as part of the activation/installation which should eliminate the need for those splitters.
If you have any further questions don't hesitate to let us know.
I just had my DSl upgraded from 6 to 15mb. I found it is 14/15 MB early in the morning but it is usually down to 5/6 MB at night. Is it because of traffic? For the activation, the guy just came to my home to show me the speed changed, nothing has been installed or not "POTS splitter" installed. I am still using the old filters I have. Thanks,