SEO - for top 100 UK tech startups

Hi,

I need SEO for a website, but unfortunately there is no room in terms of putting loads of text on the home page, not even in the footer and not even in the footer and changing the colour so it doesn't show up on the home page (these are some of the recommendations we've been told)

I know it will be a bit harder maybe to rank for but it will be worth it.

We are on page 1 of google.co.uk for a few keywords regarding mobile app development and mobile app developers based in the UK.

But we also want to rank for high traffic keywords relating to iPhone UI design as we also design UI for iPhone, iPad and also Android etc.

I would be keen to hear what keywords you think would be best to target for UI design services related to iPhone and Android and how long you would estimate it would take to rank on page 1 of google.co.uk

Thanks.