Changes

* [[Timeline of animal testing]] (Small addition of four rows on 28 April 2019)

Remove from list when updated to contract work page [https://contractwork.vipulnaik.com/worker.php?worker=Sebastian+Sanchez] and [https://github.com/vipulnaik/contractwork/blob/master/contributor-lists/sebastian-sanchez-list.mediawiki].

== Currently working or in plan to work ==

* [[Timeline of mobile telephony]] (expand: Voice over IP calling (for timeline of mobile telephony)

- Wi-Fi calling (for both timelines)- The nature of mobile phone voice and data plans, and how these have evolved over time - Cellular connectivity in underground areas, such as subways (I have some example events in https://timelines.issarice.com/wiki/Timeline_of_Bay_Area_Rapid_Transit - Move to IPv6 - tethering and hotspots created by mobile phones are worth mentioning, maybe in both timelines )