Only if your router doesn't support support your line speed or the router is faulty; when you will get a Hub 3 by default.
Superuser 2017/18 Use Kudos to say thanks Mark answer as "helpful" only when the problem is solved Please don't send me private messages unless I ask you to. I do not work for VM. The advice I give is based on my best understanding of VM policy and practice. You rely on it at your own risk.
i would add a rider to the advice above - if you have the SH1 then yes you should be able to get a free upgrade - it may or may not be totally free - there may be a postage cost
so if you have a SH1 ring retentions - dont get too involved just say the wifi is crap - which it is and see what they say
dial 150 or 0345 454 1111 and follow the prompts to - you are thinking of leaving us - dont worry about that they do much more - open 'till 8pm - 6pm on saturdays - closed sunday and the plus is its a UK call centre