Component for insertion into a cellular communication network to reduce redundant signaling on the network or between the network and other networks, comprises: an extractor, to extract signaling passing the insertion point towards a destination, modify the signaling and reinsert the signaling for sending onwards. The extractor comprises a signal part remover to remove a part determined to be present at the destination; and an inserter for inserting a flag into the signaling to indicate the removal. The modified signal is sent on to the destination where a complementary component reads the flag and reinserts the extracted part from a database of its own. Location update activity often involves redundant transfer of user profiles, which the components herein can save.