This can happen for several reasons:

  • a cold start – you didn’t use your phone GPS for several days or you moved very far away from the last place, where GPS was active. A cold start may take 10 minutes and more.
  • your phone can’t find enough satellites with known coordinates or a good signal level – due to being inside a building, tunnel, or somewhere without a clear view of the sky.
  • bad environment conditions (e.g., powerful UHF devices, a magnetic storm, special window-coatings) blocking airwave emissions.
  • please read the FAQ ‘It does not work on my Galaxy S2′