Seeing UX as one person’s responsibility
When it comes to UX design, the people involved should ideally create a cross-disciplinary team with a variety of specializations. Cross-disciplinary collaboration helps replace self-referential design decisions with more holistically framed solutions.
Only considering UX at the beginning of development 
Great mobile experiences follow the five stages of design thinking: empathize, define, ideate, prototype, and test. These stages, however, are not necessarily sequential and can often operate in tandem, repeating in an iterative cycle.
Not empathizing with your users
Meaningful products have personal significance and resonate with user’s needs while aligning with their values. As much as possible, designer need to step outside their frame or reference and become the user if they’re going to create a mobile solution that stands out in the market.
Designing for yourself and not the user 
Development teams can often form strong opinions about a product. Good UX designers separate their personal preferences from user preferences.
Following your competition too closely
What works for one company might not work for another. Instead of imitating your competition, learn from them and combine your learnings with innovation to establish a competitive edge.
Overwhelming users with too much content 
Use content to guide the user through your app. providing value along the way. You don’t need to cram everything onto the first screen . If a mobile app is going to be useful, it needs to be simple.
Having an overly complex UI design
Complex UI design can take away from the user experience if there are too many distractions or confusing call-to-actions. Instead of including elements that lack purpose, simplify with more meaning. Good design can be elegant without all of the intricacies.
Including too many features 
Rather than including too many elements and features, understand your brand’s strengths. Find the unique value proposition that will give you the competitive edge you need.
Confusing UX with UI
An app’s UX and UI are different. Knowing when and how to utilize both of these design disciplines will be crucial to the success of your app
