Starting with Dynamics CRM 2016, in the mobile clients (phone and tablet), custom controls can replace form fields, form lists, dashboard lists and entity grids. These include:

• Linear and Radial gauges for numeric values
• Calendar control
• Linear slider
• Option set
• Flip switch
• Star rating
• Radial Knob
• Arc knob

For more details, review https://technet.microsoft.com/library/dn531185.aspx#BKMK_MobileControls