Warning: TSP Funds iPhone app not recommended Published March 12, 2013 ROBINS AIR FORCE BASE, Ga. -- The Thrift Savings Plan website issued a warning to iPhone users to avoid using the "TSP Funds" app from the Apple App store. The free app is not sactioned by TSP because it asks participants for account login information. This app is not being offered through the TSP and the TSP does not recommend using this application to access TSP accounts. TSP warns that providing this information could result in a security risk to your account. Source: https://www.tsp.gov/whatsnew/plan/planNews.shtml#iPhoneApp