Translation:Can we chat on Wechat?
does this refer to messaging someone on wechat, actually making a call, or can it mean both?
Also, from what I understand, many mainland Chinese like to record (and play back) what each other says instead of typing words out as it is more tedious. Calls tend to be made amongst the older generation who may be less tech savvy.
wechat originated as a platform for short voice messages, so this could mean a mix of text and voice. when people call nowadays it is usually video for which you would say 视频