In log I see: Code: 01.11.0112 00:27:22 incoming cell tower name Location, cell id 50357 01.11.0112 00:28:10 cell id change 50351 01.11.0112 00:28:13 incoming cell tower name Location, cell id 50351 01.11.0112 00:29:24 cell id change 50357 01.11.0112 00:29:26 incoming cell tower name Location, cell id 50357 01.11.0112 00:30:37 cell id change 50351 01.11.0112 00:30:40 incoming cell tower name Location, cell id 50351 This means that your phone really alternates between two BTS.
01.11.0112 00:27:22 incoming cell tower name Location, cell id 50357 01.11.0112 00:28:10 cell id change 50351 01.11.0112 00:28:13 incoming cell tower name Location, cell id 50351 01.11.0112 00:29:24 cell id change 50357 01.11.0112 00:29:26 incoming cell tower name Location, cell id 50357 01.11.0112 00:30:37 cell id change 50351 01.11.0112 00:30:40 incoming cell tower name Location, cell id 50351