LUCKNOW: The Data services of Bharat Sanchar Nigam Limited in 11 east UP districts including Lucknow will be affected for eight hours from 10pm on March 25 till 6am on March 26 due to replacement of router installed at Kaiserbagh telephone exchange in Lucknow.Ten other districts affected include Faizabad, Sultanpur, Hardoi, Sitapur, Shahjahanpur, Lakhimpur, Bahraich, Gonda, Barabanki and Rae Bareli, said BSNL spokesperson Sudhanshu Mishra.He said there will be no interruption in calls, only data will be affected. The replacement is being done following complaints of data services since long.