Cannot access salesforce from ios mobile phone, whether through an app or URL but able to access it from laptop, with same credential that are used to login from  mobile.(there is no restricted login hours &  API enabled flag is checked )

Hi All, 
Need your help with the following, actually my requirement is to create a login page which will redirect to registration for new signup.
And want to store the data of allth user who all are getting register on that page.
It will be of great help if you all can help me with a solution.

Cannot access salesforce from ios mobile phone, whether through an app or URL but able to access it from laptop, with same credential that are used to login from  mobile.(there is no restricted login hours &  API enabled flag is checked )

Hi All, 
Need your help with the following, actually my requirement is to create a login page which will redirect to registration for new signup.
And want to store the data of allth user who all are getting register on that page.
It will be of great help if you all can help me with a solution.