We used to get Device ID/IMEI using the following command:
adb shell dumpsys iphonesubinfo
But since last Android update (5.0 - Lollilop), this command doesn't return anything, I performed this test on both Nexus 4 and Nexus 5.
I know I can get the IMEI from code, which is still working, but does anyone has a workaround for ADB ?
You can always just use service call command to call the service methods.
here are the TRANSACTION CODES for the iphonesubinfo service in android-5.0.0_r1:
1 getDeviceId
2 getDeviceIdForSubscriber
3 getImeiForSubscriber
4 getDeviceSvn
5 getSubscriberId
6 getSubscriberIdForSubscriber
7 getGroupIdLevel1
8 getGroupIdLevel1ForSubscriber
9 getIccSerialNumber
10 getIccSerialNumberForSubscriber
11 getLine1Number
12 getLine1NumberForSubscriber
13 getLine1AlphaTag
14 getLine1AlphaTagForSubscriber
15 getMsisdn
16 getMsisdnForSubscriber
17 getVoiceMailNumber
18 getVoiceMailNumberForSubscriber
19 getCompleteVoiceMailNumber
20 getCompleteVoiceMailNumberForSubscriber
21 getVoiceMailAlphaTag
22 getVoiceMailAlphaTagForSubscriber
23 getIsimImpi
24 getIsimDomain
25 getIsimImpu
26 getIsimIst
27 getIsimPcscf
28 getIsimChallengeResponse
29 getIccSimChallengeResponse
Most methods require root. But fortunately getDeviceId (the one you need to get device's IMEI/MEID) does not.
For proper parsing of the service call command output on the device side and without external dependencies see my answer here
Also read Calling Android services from ADB shell for more details.