To counter one telco having bad line, I solve it by using 2 telco lines.

1 main line is my Yoodo/Spark number for rm25 a month with 35GB, a second line Hotlink with 365 SIM validity & PAYG internet (1gb/rm2). If my main line has no signal, the maxis one high chance will have line. By using my Hotlink as a fallback, my monthly cost ended up under Rm35, yet i have enough internet data AND very good coverage everywhere I go 99% of the time.

Though I keep my costs low because i dont have to call people a lot, so I choose the plan with like 100 minutes per month. You may have different needs but consider having 2 lines by opting the lower cost option if you prioritize higher network availability.

I also checked it via USSD - to really confirm that the credit is there. Only then I proceeded and buy internet pass.