I am regular user of this service provider.
No doubt they provide very low call rates and best offers as unlimited and minute packs .but there are sevral problms with this network, First off all they do not have good netork in every area, youbcan get network only in city but if you are traveling in interior location you can not fid network . They are very pathetic network provider, Second problem is that they do very much promotional calls, their cals are very irritating . Third issue is tht do not have any good roaming plan.
My suggestion is for teenor, please have attention on your network and roaming packs. So that customer can use smoothly your services.