Faster alternatives to BC847C / BC859C
From Infineon:
SMBT2222A: \$f_T\$ > 300MHz, complementary: SMBT2907A
SMBT3904: \$f_T\$ > 300MHz, dual NPN, low power, complementary: SMBT3906  

From NXP:
BF570: \$f_T\$ > 490MHz
BF840: \$f_T\$ typical 380 MHz
BFS20: \$f_T\$ > 275, typical 450 MHz