No,. While some mobile providers cap their customers speed depending on the price plan, with An Post Mobile your data speed does not
depend on your price plan, as there are no speed caps.
Factors that affect Data Speeds:
Geography (signal can be obscured by mountains, hills, forests),
Buildings (large buildings obscuring the signal),
Distance from a mast (the further you are from a mast, the lower the data service connection will be),
Your device (if your mobile phone does not support 4G, you will not be able to achieve the higher 4G speeds),
Crowds (high call and usage due to crowded areas might cause data speeds and voice calls to get worse)