Thanks Pix million times.
We use different frequencies for TRX2 because of old phones supporting PGSM and for TRX3&TRX4 G1 because of interference of other operaters in PGSM. We thought that’s optimal solution satisfying costumers with old phones and avoid somehow intererence. We use B9, upgrading in B10 can we mix G1+PGSM? You’re right, there is to much overlaps and we are working on it.