You can call Tinitell after you have paired it with the app on your smartphone.
To call Tinitell from the app just tap the profile picture of the Tinitell (bottom right corner of the app) and tap again on the Calling symbol. You can alternatively call Tinitell from the smartphone agenda, like calling any other contact in your list.
If you are having trouble calling to or from Tinitell, please check the following: that you have inserted the SIM card correctly and that you are in an area with 2G coverage, that you have enough credit on Tinitell's SIM card and that you have activated the SIM card with the carrier. Here's a list of tested carriers for Tinitell. If the answer is "yes" to all these questions and you still encounter issues receiving location updates, please email us to firstname.lastname@example.org and our support team will help out.