Register mobitela.hr (.hr is the Croatian extension) if you want to develop the domain for that country. The .com is inferior to .hr in this case.
In addition, I believe that Mobitela is easy to remember for people that are used to hearing or saying words ending with "la". If developed properly (maybe an online cellphone store for the Croatian public), it could be worth $xxx - low $xxxx. This is only if the domain is developed and you get actual sales.