Observation
Over the last 30 days, mobile devices show a significantly higher cost per conversion in some campaigns. Example:
In Campaign “Search - UK - Sandals Summer Sale 2024 - 50% Off”, mobile has a conversion cost of $119.48, while desktop has a much lower conversion cost of $26.89.
Campaigns targeting mobile users are driving up costs without proportionate returns, leading to a lower return on ad spend (ROAS).
Recommendation
• Device Bid Adjustments: Reduce bids for mobile campaigns where the CPC is very high. For instance, consider lowering mobile bids by 50-60% for campaign “Search - UK - Sandals Summer Sale 2024 - 50% Off”.
• Mobile-Optimized Landing Pages: Ensure that landing pages are fully optimized for mobile.
• Exclude Underperforming Devices: In extreme cases, consider excluding mobile devices from campaigns where desktop performs significantly better.