# Arduino sending data through bluetooth to multiple phones--possible? **URL:** \ **Category:** General Guidance\ **Created:** [February 10, 2017, 4:18am UTC](https://forum.arduino.cc/t/arduino-sending-data-through-bluetooth-to-multiple-phones-possible/436939 "2017-02-10T04:18:51Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![KrisKasprzak](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/kriskasprzak/32/221987_2.png) [@KrisKasprzak](https://forum.arduino.cc/u/KrisKasprzak)\ **Post date:** [February 10, 2017, 4:18am UTC](https://forum.arduino.cc/t/arduino-sending-data-through-bluetooth-to-multiple-phones-possible/436939/1 "2017-02-10T04:18:51Z")
All, I have a project where my Arduino and HC-05 sends data to an Andriod phone--it works fine. Can additional phones be paired to the HC-05? The phones will only receive data. If not is there any way to get this to work? Thanks in advance. ---
**Author:** ![KrisKasprzak](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/kriskasprzak/32/221987_2.png) [@KrisKasprzak](https://forum.arduino.cc/u/KrisKasprzak)\ **Post date:** [February 13, 2017, 4:42am UTC](https://forum.arduino.cc/t/arduino-sending-data-through-bluetooth-to-multiple-phones-possible/436939/2 "2017-02-13T04:42:55Z")
From my tests and what I've been reading, it looks like phones are Master only--so I can't pair multiple phones to the same HC-05. I guess I need them to be slaves, but that doesn't look possible. I can't pair more that one phone to my HC-05 device and if I set my HC-05 to master, I can't pair it to the phone--apparently you can't pair a master to a master. Basically I need to send small amounts of data to several cell phones every few seconds for around 90 minutes. Anyone seen any alternatives? Maybe I can set up one "master" phone to the HC-05, then have it host data to the web for other phones to pull? I don't know, kinda stumped here.... Thanks in advance. ---
**Author:** ![Nick\_Pyner](https://avatars.discourse-cdn.com/v4/letter/n/e8c25b/32.png) [@Nick\_Pyner](https://forum.arduino.cc/u/Nick_Pyner)\ **Post date:** [February 13, 2017, 4:52am UTC](https://forum.arduino.cc/t/arduino-sending-data-through-bluetooth-to-multiple-phones-possible/436939/3 "2017-02-13T04:52:16Z")
> KrisKasprzak: > From my tests and what I've been reading, it looks like phones are Master only--so I can't pair multiple phones to the same HC-05. I guess I need them to be slaves, but that doesn't look possible. I can't pair more that one phone to my HC-05 device and if I set my HC-05 to master, I can't pair it to the phone--apparently you can't pair a master to a master. I think that's nonsense. You are implying that a master can only only pair with a slave - which is surely nonsense. I suspect the only thing that counts is that a master initiates the connection, and it neither knows nor cares if the other party is a master or not. In this case, the HC-05 does the connecting, even if the phone has to do the pairing, which is essentially a formality. I also suspect you don't understand the difference between pairing and connecting. I'm not sure how good an idea it is but I believe you might be able to it, The problems are entirely at the Android end, as you will need a terminal that can auto-connect. As far as Arduino is concerned, it is just a matter turning Bluetooth power off and on, and allowing only connection to a specific Android each time you do so. This is rather like what your car does each time you turn the radio on. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [May 5, 2021, 6:07pm UTC](https://forum.arduino.cc/t/arduino-sending-data-through-bluetooth-to-multiple-phones-possible/436939/4 "2021-05-05T18:07:16Z")
Closed on May 5, 2021, 6:07pm UTC