Many older adults or seniors face mobility issues as they age, for example, switching from driving to using carpool, taxi, or staying on fixed routes. Seniors require responsive transportation services to attend activities. Unfortunately, there are limited tools to assist seniors to find the most appropriate transportation options given their mobility needs (e.g., inability to walk long distances, use of a cane). Mobile devices (e.g. smartphones, tablets, etc.) have demonstrated to be a useful tool to provide real-Time information that has the potential to assist seniors with mobility challenges. This paper focuses on investigating senior citizens' mobility needs in El Paso, Texas and New York City, New York in order to define the requirements and recommendations for an ad-hoc solution on smart mobility for seniors, using state-of-The-Art mobile technologies. In order to identify the main concerns and requirements to assist in mobility of seniors, a survey was conducted at various senior recreation centers across El Paso and New York City with a total of 458 and 61 responses, respectively. Survey results indicate that: (i) the most required assistance for seniors is the avoidance of traffic congestion; (ii) the majority of seniors who own mobile devices are not using the available applications or functions to meet their mobility needs; and (iii) seniors indicated that they prefer mobile applications that are easy and intuitive to use. These findings provide additional insights to those from previous surveys. We provide recommendations for researchers and developers interested in creating solutions for mobility of seniors based on these findings and the interactions with seniors when the survey was performed.